17 files changed, 324 insertions, 268 deletions

diff --git a/codegen/canon.zig b/codegen/canon.zig
index 28b7f28..89a9070 100644
--- a/codegen/canon.zig
+++ b/codegen/canon.zig
@@ -1,32 +1,30 @@
 const std = @import("std");
 const builtin = @import("builtin");
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
 
+    var line_buf: [4096]u8 = undefined;
+    var write_buf: [4096]u8 = undefined;
     // Process UnicodeData.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/UnicodeData.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
     var args_iter = try std.process.argsWithAllocator(allocator);
     defer args_iter.deinit();
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
-
+    var file_writer = out_file.writer(&write_buf);
+    var writer = &file_writer.interface;
     const endian = builtin.cpu.arch.endian();
-    var line_buf: [4096]u8 = undefined;
 
-    lines: while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    lines: while (in_reader.interface.takeDelimiterInclusive('\n')) |line| {
         if (line.len == 0) continue;
 
         var field_iter = std.mem.splitScalar(u8, line, ';');
@@ -60,8 +58,12 @@ pub fn main() !void {
 
         try writer.writeInt(u8, @intCast(len), endian);
         for (cps[0..len]) |cp| try writer.writeInt(u24, cp, endian);
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     try writer.writeInt(u16, 0, endian);
-    try out_comp.flush();
+    try writer.flush();
 }
diff --git a/codegen/case_prop.zig b/codegen/case_prop.zig
index 6c912a8..66eb62c 100644
--- a/codegen/case_prop.zig
+++ b/codegen/case_prop.zig
@@ -22,7 +22,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -35,10 +35,9 @@ pub fn main() !void {
     // Process DerivedCoreProperties.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/DerivedCoreProperties.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         const no_comment = if (mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
 
@@ -79,15 +78,20 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u8).init(allocator);
+    var stage2 = std.array_list.Managed(u8).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u8{0} ** block_size;
@@ -118,18 +122,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    try writer.writeAll(stage2.items);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    try writer.interface.writeAll(stage2.items);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/ccc.zig b/codegen/ccc.zig
index a01c8d2..b9b2bc3 100644
--- a/codegen/ccc.zig
+++ b/codegen/ccc.zig
@@ -21,7 +21,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -34,10 +34,9 @@ pub fn main() !void {
     // Process DerivedCombiningClass.txt
     var cc_file = try std.fs.cwd().openFile("data/unicode/extracted/DerivedCombiningClass.txt", .{});
     defer cc_file.close();
-    var cc_buf = std.io.bufferedReader(cc_file.reader());
-    const cc_reader = cc_buf.reader();
+    var cc_reader = cc_file.reader(&line_buf);
 
-    while (try cc_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (cc_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
 
@@ -68,15 +67,20 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u8).init(allocator);
+    var stage2 = std.array_list.Managed(u8).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u8{0} ** block_size;
@@ -107,18 +111,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    try writer.writeAll(stage2.items);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    try writer.interface.writeAll(stage2.items);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/compat.zig b/codegen/compat.zig
index 07616fc..835a636 100644
--- a/codegen/compat.zig
+++ b/codegen/compat.zig
@@ -1,7 +1,7 @@
 const std = @import("std");
 const builtin = @import("builtin");
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -9,24 +9,22 @@ pub fn main() !void {
     // Process UnicodeData.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/UnicodeData.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var line_buf: [4096]u8 = undefined;
+    var write_buf: [4096]u8 = undefined;
+    var in_reader = in_file.reader(&line_buf);
 
     var args_iter = try std.process.argsWithAllocator(allocator);
     defer args_iter.deinit();
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    var line_buf: [4096]u8 = undefined;
 
-    lines: while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    lines: while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0) continue;
 
         var field_iter = std.mem.splitScalar(u8, line, ';');
@@ -55,10 +53,15 @@ pub fn main() !void {
             }
         }
 
-        try writer.writeInt(u8, @intCast(len), endian);
-        for (cps[0..len]) |cp| try writer.writeInt(u24, cp, endian);
+        try writer.interface.writeInt(u8, @intCast(len), endian);
+        for (cps[0..len]) |cp| try writer.interface.writeInt(u24, cp, endian);
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
-    try writer.writeInt(u16, 0, endian);
-    try out_comp.flush();
+    try writer.interface.writeInt(u16, 0, endian);
+    try writer.interface.flush();
 }
diff --git a/codegen/core_props.zig b/codegen/core_props.zig
index f60c7a9..19063f6 100644
--- a/codegen/core_props.zig
+++ b/codegen/core_props.zig
@@ -22,7 +22,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -35,10 +35,9 @@ pub fn main() !void {
     // Process DerivedCoreProperties.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/DerivedCoreProperties.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         const no_comment = if (mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
 
@@ -82,15 +81,19 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u8).init(allocator);
+    var stage2 = std.array_list.Managed(u8).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u8{0} ** block_size;
@@ -121,18 +124,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var out_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&out_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    try writer.writeAll(stage2.items);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    try writer.interface.writeAll(stage2.items);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/dwp.zig b/codegen/dwp.zig
index 5e5bf6a..fad08d1 100644
--- a/codegen/dwp.zig
+++ b/codegen/dwp.zig
@@ -23,7 +23,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -36,10 +36,9 @@ pub fn main() !void {
     // Process DerivedEastAsianWidth.txt
     var deaw_file = try std.fs.cwd().openFile("data/unicode/extracted/DerivedEastAsianWidth.txt", .{});
     defer deaw_file.close();
-    var deaw_buf = std.io.bufferedReader(deaw_file.reader());
-    const deaw_reader = deaw_buf.reader();
+    var deaw_reader = deaw_file.reader(&line_buf);
 
-    while (try deaw_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (deaw_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0) continue;
 
         // @missing ranges
@@ -88,15 +87,18 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     // Process DerivedGeneralCategory.txt
     var dgc_file = try std.fs.cwd().openFile("data/unicode/extracted/DerivedGeneralCategory.txt", .{});
     defer dgc_file.close();
-    var dgc_buf = std.io.bufferedReader(dgc_file.reader());
-    const dgc_reader = dgc_buf.reader();
+    var dgc_reader = dgc_file.reader(&line_buf);
 
-    while (try dgc_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (dgc_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
 
@@ -139,15 +141,20 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(i4).init(allocator);
+    var stage2 = std.array_list.Managed(i4).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]i4{0} ** block_size;
@@ -227,18 +234,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    for (stage2.items) |i| try writer.writeInt(i8, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.interface.writeInt(i8, i, endian);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/fold.zig b/codegen/fold.zig
index cb73cca..cc381a8 100644
--- a/codegen/fold.zig
+++ b/codegen/fold.zig
@@ -2,23 +2,21 @@ const std = @import("std");
 const builtin = @import("builtin");
 const mem = std.mem;
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     defer std.debug.assert(gpa.deinit() == .ok);
     const allocator = gpa.allocator();
 
+    var line_buf: [4096]u8 = undefined;
     // Process DerivedCoreProperties.txt
     var props_file = try std.fs.cwd().openFile("data/unicode/DerivedCoreProperties.txt", .{});
     defer props_file.close();
-    var props_buf = std.io.bufferedReader(props_file.reader());
-    const props_reader = props_buf.reader();
+    var props_reader = props_file.reader(&line_buf);
 
     var props_map = std.AutoHashMap(u21, void).init(allocator);
     defer props_map.deinit();
 
-    var line_buf: [4096]u8 = undefined;
-
-    props_lines: while (try props_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    props_lines: while (props_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
 
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -49,18 +47,21 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     var codepoint_mapping = std.AutoArrayHashMap(u21, [3]u21).init(allocator);
     defer codepoint_mapping.deinit();
 
     // Process CaseFolding.txt
     var cp_file = try std.fs.cwd().openFile("data/unicode/CaseFolding.txt", .{});
     defer cp_file.close();
-    var cp_buf = std.io.bufferedReader(cp_file.reader());
-    const cp_reader = cp_buf.reader();
+    var cp_reader = cp_file.reader(&line_buf);
 
-    while (try cp_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (cp_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
 
         var field_it = std.mem.splitScalar(u8, line, ';');
@@ -81,9 +82,14 @@ pub fn main() !void {
         }
 
         try codepoint_mapping.putNoClobber(codepoint, mapping_buf);
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
-    var changes_when_casefolded_exceptions = std.ArrayList(u21).init(allocator);
+    var changes_when_casefolded_exceptions = std.array_list.Managed(u21).init(allocator);
     defer changes_when_casefolded_exceptions.deinit();
 
     {
@@ -221,32 +227,31 @@ pub fn main() !void {
         _ = args_iter.skip();
         const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-        const compressor = std.compress.flate.deflate.compressor;
+        var write_buf: [4096]u8 = undefined;
         var out_file = try std.fs.cwd().createFile(output_path, .{});
         defer out_file.close();
-        var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-        const writer = out_comp.writer();
+        var writer = out_file.writer(&write_buf);
 
         const endian = builtin.cpu.arch.endian();
         // Table metadata.
-        try writer.writeInt(u24, @intCast(codepoint_cutoff), endian);
-        try writer.writeInt(u24, @intCast(multiple_codepoint_start), endian);
+        try writer.interface.writeInt(u24, @intCast(codepoint_cutoff), endian);
+        try writer.interface.writeInt(u24, @intCast(multiple_codepoint_start), endian);
         // Stage 1
-        try writer.writeInt(u16, @intCast(meaningful_stage1.len), endian);
-        try writer.writeAll(meaningful_stage1);
+        try writer.interface.writeInt(u16, @intCast(meaningful_stage1.len), endian);
+        try writer.interface.writeAll(meaningful_stage1);
         // Stage 2
-        try writer.writeInt(u16, @intCast(stage2.len), endian);
-        try writer.writeAll(stage2);
+        try writer.interface.writeInt(u16, @intCast(stage2.len), endian);
+        try writer.interface.writeAll(stage2);
         // Stage 3
-        try writer.writeInt(u16, @intCast(stage3.len), endian);
-        for (stage3) |offset| try writer.writeInt(i24, offset, endian);
+        try writer.interface.writeInt(u16, @intCast(stage3.len), endian);
+        for (stage3) |offset| try writer.interface.writeInt(i24, offset, endian);
         // Changes when case folded
         // Min and max
-        try writer.writeInt(u24, std.mem.min(u21, changes_when_casefolded_exceptions.items), endian);
-        try writer.writeInt(u24, std.mem.max(u21, changes_when_casefolded_exceptions.items), endian);
-        try writer.writeInt(u16, @intCast(changes_when_casefolded_exceptions.items.len), endian);
-        for (changes_when_casefolded_exceptions.items) |cp| try writer.writeInt(u24, cp, endian);
+        try writer.interface.writeInt(u24, std.mem.min(u21, changes_when_casefolded_exceptions.items), endian);
+        try writer.interface.writeInt(u24, std.mem.max(u21, changes_when_casefolded_exceptions.items), endian);
+        try writer.interface.writeInt(u16, @intCast(changes_when_casefolded_exceptions.items.len), endian);
+        for (changes_when_casefolded_exceptions.items) |cp| try writer.interface.writeInt(u24, cp, endian);
 
-        try out_comp.flush();
+        try writer.interface.flush();
     }
 }
diff --git a/codegen/gbp.zig b/codegen/gbp.zig
index 3fc4461..d654cf1 100644
--- a/codegen/gbp.zig
+++ b/codegen/gbp.zig
@@ -47,7 +47,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -66,10 +66,9 @@ pub fn main() !void {
     // Process Indic
     var indic_file = try std.fs.cwd().openFile("data/unicode/DerivedCoreProperties.txt", .{});
     defer indic_file.close();
-    var indic_buf = std.io.bufferedReader(indic_file.reader());
-    const indic_reader = indic_buf.reader();
+    var indic_reader = indic_file.reader(&line_buf);
 
-    while (try indic_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (indic_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         if (std.mem.indexOf(u8, line, "InCB") == null) continue;
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -100,15 +99,18 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     // Process GBP
     var gbp_file = try std.fs.cwd().openFile("data/unicode/auxiliary/GraphemeBreakProperty.txt", .{});
     defer gbp_file.close();
-    var gbp_buf = std.io.bufferedReader(gbp_file.reader());
-    const gbp_reader = gbp_buf.reader();
+    var gbp_reader = gbp_file.reader(&line_buf);
 
-    while (try gbp_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (gbp_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
 
@@ -138,15 +140,18 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     // Process Emoji
     var emoji_file = try std.fs.cwd().openFile("data/unicode/emoji/emoji-data.txt", .{});
     defer emoji_file.close();
-    var emoji_buf = std.io.bufferedReader(emoji_file.reader());
-    const emoji_reader = emoji_buf.reader();
+    var emoji_reader = emoji_file.reader(&line_buf);
 
-    while (try emoji_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (emoji_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         if (std.mem.indexOf(u8, line, "Extended_Pictographic") == null) continue;
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -170,15 +175,20 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u16).init(allocator);
+    var stage2 = std.array_list.Managed(u16).init(allocator);
     defer stage2.deinit();
 
     var stage3 = std.AutoArrayHashMap(u8, u16).init(allocator);
@@ -227,22 +237,21 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    for (stage2.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.interface.writeInt(u16, i, endian);
 
     const props_bytes = stage3.keys();
-    try writer.writeInt(u16, @intCast(props_bytes.len), endian);
-    try writer.writeAll(props_bytes);
+    try writer.interface.writeInt(u16, @intCast(props_bytes.len), endian);
+    try writer.interface.writeAll(props_bytes);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/gencat.zig b/codegen/gencat.zig
index fe06bd7..7dedb5d 100644
--- a/codegen/gencat.zig
+++ b/codegen/gencat.zig
@@ -67,10 +67,9 @@ pub fn main() !void {
     // Process DerivedGeneralCategory.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/extracted/DerivedGeneralCategory.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
 
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -101,18 +100,23 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u5).init(allocator);
+    var stage2 = std.array_list.Managed(u5).init(allocator);
     defer stage2.deinit();
 
-    var stage3 = std.ArrayList(u5).init(allocator);
+    var stage3 = std.array_list.Managed(u5).init(allocator);
     defer stage3.deinit();
 
     var block: Block = [_]u5{0} ** block_size;
@@ -151,21 +155,20 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    for (stage2.items) |i| try writer.writeInt(u8, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.interface.writeInt(u8, i, endian);
 
-    try writer.writeInt(u8, @intCast(stage3.items.len), endian);
-    for (stage3.items) |i| try writer.writeInt(u8, i, endian);
+    try writer.interface.writeInt(u8, @intCast(stage3.items.len), endian);
+    for (stage3.items) |i| try writer.interface.writeInt(u8, i, endian);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/hangul.zig b/codegen/hangul.zig
index 2c42bb7..6768b3f 100644
--- a/codegen/hangul.zig
+++ b/codegen/hangul.zig
@@ -30,7 +30,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -43,10 +43,9 @@ pub fn main() !void {
     // Process HangulSyllableType.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/HangulSyllableType.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
 
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -77,15 +76,19 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u3).init(allocator);
+    var stage2 = std.array_list.Managed(u3).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u3{0} ** block_size;
@@ -116,18 +119,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    for (stage2.items) |i| try writer.writeInt(u8, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.interface.writeInt(u8, i, endian);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/lower.zig b/codegen/lower.zig
index a053fe3..c11cb0a 100644
--- a/codegen/lower.zig
+++ b/codegen/lower.zig
@@ -6,27 +6,25 @@ pub fn main() !void {
     defer arena.deinit();
     const allocator = arena.allocator();
 
+    var line_buf: [4096]u8 = undefined;
+    var write_buf: [4096]u8 = undefined;
     // Process UnicodeData.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/UnicodeData.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
     var args_iter = try std.process.argsWithAllocator(allocator);
     defer args_iter.deinit();
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    var line_buf: [4096]u8 = undefined;
 
-    lines: while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    lines: while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0) continue;
 
         var field_iter = std.mem.splitScalar(u8, line, ';');
@@ -42,16 +40,20 @@ pub fn main() !void {
                 13 => {
                     // Simple lowercase mapping
                     if (field.len == 0) continue :lines;
-                    try writer.writeInt(i24, cp, endian);
+                    try writer.interface.writeInt(i24, cp, endian);
                     const mapping = try std.fmt.parseInt(i24, field, 16);
-                    try writer.writeInt(i24, mapping - cp, endian);
+                    try writer.interface.writeInt(i24, mapping - cp, endian);
                 },
 
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
-    try writer.writeInt(u24, 0, endian);
-    try out_comp.flush();
+    try writer.interface.writeInt(u24, 0, endian);
+    try writer.interface.flush();
 }
diff --git a/codegen/normp.zig b/codegen/normp.zig
index 60dabdc..71a1ae5 100644
--- a/codegen/normp.zig
+++ b/codegen/normp.zig
@@ -21,7 +21,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -34,10 +34,9 @@ pub fn main() !void {
     // Process DerivedNormalizationProps.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/DerivedNormalizationProps.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
 
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -78,15 +77,19 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u3).init(allocator);
+    var stage2 = std.array_list.Managed(u3).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u3{0} ** block_size;
@@ -117,18 +120,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    for (stage2.items) |i| try writer.writeInt(u8, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.interface.writeInt(u8, i, endian);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/numeric.zig b/codegen/numeric.zig
index 038ac0a..cf918e8 100644
--- a/codegen/numeric.zig
+++ b/codegen/numeric.zig
@@ -22,7 +22,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -35,10 +35,9 @@ pub fn main() !void {
     // Process DerivedNumericType.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/extracted/DerivedNumericType.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         const no_comment = if (mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
 
@@ -79,15 +78,20 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u8).init(allocator);
+    var stage2 = std.array_list.Managed(u8).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u8{0} ** block_size;
@@ -118,18 +122,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    try writer.writeAll(stage2.items);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    try writer.interface.writeAll(stage2.items);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/props.zig b/codegen/props.zig
index 24b22e0..6ff0a33 100644
--- a/codegen/props.zig
+++ b/codegen/props.zig
@@ -22,7 +22,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -35,10 +35,9 @@ pub fn main() !void {
     // Process PropList.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/PropList.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
         const no_comment = if (mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
 
@@ -79,15 +78,20 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u8).init(allocator);
+    var stage2 = std.array_list.Managed(u8).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u8{0} ** block_size;
@@ -118,18 +122,16 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    try writer.writeAll(stage2.items);
-
-    try out_comp.flush();
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    try writer.interface.writeAll(stage2.items);
+    try writer.interface.flush();
 }
diff --git a/codegen/scripts.zig b/codegen/scripts.zig
index 530205d..bdd3d9d 100644
--- a/codegen/scripts.zig
+++ b/codegen/scripts.zig
@@ -195,7 +195,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -208,10 +208,9 @@ pub fn main() !void {
     // Process DerivedGeneralCategory.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/Scripts.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
 
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -245,18 +244,22 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u8).init(allocator);
+    var stage2 = std.array_list.Managed(u8).init(allocator);
     defer stage2.deinit();
 
-    var stage3 = std.ArrayList(u8).init(allocator);
+    var stage3 = std.array_list.Managed(u8).init(allocator);
     defer stage3.deinit();
 
     var block: Block = [_]u8{0} ** block_size;
@@ -295,21 +298,20 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    for (stage2.items) |i| try writer.writeInt(u8, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.interface.writeInt(u8, i, endian);
 
-    try writer.writeInt(u8, @intCast(stage3.items.len), endian);
-    for (stage3.items) |i| try writer.writeInt(u8, i, endian);
+    try writer.interface.writeInt(u8, @intCast(stage3.items.len), endian);
+    for (stage3.items) |i| try writer.interface.writeInt(u8, i, endian);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }
diff --git a/codegen/upper.zig b/codegen/upper.zig
index 5848911..7d96a0e 100644
--- a/codegen/upper.zig
+++ b/codegen/upper.zig
@@ -1,32 +1,29 @@
 const std = @import("std");
 const builtin = @import("builtin");
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
 
+    var line_buf: [4096]u8 = undefined;
+    var write_buf: [4096]u8 = undefined;
     // Process UnicodeData.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/UnicodeData.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
     var args_iter = try std.process.argsWithAllocator(allocator);
     defer args_iter.deinit();
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
-
+    var file_writer = out_file.writer(&write_buf);
     const endian = builtin.cpu.arch.endian();
-    var line_buf: [4096]u8 = undefined;
 
-    lines: while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    lines: while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0) continue;
 
         var field_iter = std.mem.splitScalar(u8, line, ';');
@@ -42,16 +39,24 @@ pub fn main() !void {
                 12 => {
                     // Simple uppercase mapping
                     if (field.len == 0) continue :lines;
-                    try writer.writeInt(i24, cp, endian);
+                    try file_writer.interface.writeInt(i24, cp, endian);
                     const mapping = try std.fmt.parseInt(i24, field, 16);
-                    try writer.writeInt(i24, mapping - cp, endian);
+                    try file_writer.interface.writeInt(i24, mapping - cp, endian);
                 },
 
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.ReadFailed => {
+            return in_reader.err orelse err;
+        },
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
 
-    try writer.writeInt(u24, 0, endian);
-    try out_comp.flush();
+    try file_writer.interface.writeInt(u24, 0, endian);
+    try file_writer.interface.flush();
 }
diff --git a/codegen/wbp.zig b/codegen/wbp.zig
index 741103e..b1ed56a 100644
--- a/codegen/wbp.zig
+++ b/codegen/wbp.zig
@@ -43,7 +43,7 @@ const BlockMap = std.HashMap(
     std.hash_map.default_max_load_percentage,
 );
 
-pub fn main() !void {
+pub fn main() anyerror!void {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
@@ -56,10 +56,9 @@ pub fn main() !void {
     // Process HangulSyllableType.txt
     var in_file = try std.fs.cwd().openFile("data/unicode/auxiliary/WordBreakProperty.txt", .{});
     defer in_file.close();
-    var in_buf = std.io.bufferedReader(in_file.reader());
-    const in_reader = in_buf.reader();
+    var in_reader = in_file.reader(&line_buf);
 
-    while (try in_reader.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
+    while (in_reader.interface.takeDelimiterExclusive('\n')) |line| {
         if (line.len == 0 or line[0] == '#') continue;
 
         const no_comment = if (std.mem.indexOfScalar(u8, line, '#')) |octo| line[0..octo] else line;
@@ -90,15 +89,19 @@ pub fn main() !void {
                 else => {},
             }
         }
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => {
+            return err;
+        },
     }
-
     var blocks_map = BlockMap.init(allocator);
     defer blocks_map.deinit();
 
-    var stage1 = std.ArrayList(u16).init(allocator);
+    var stage1 = std.array_list.Managed(u16).init(allocator);
     defer stage1.deinit();
 
-    var stage2 = std.ArrayList(u5).init(allocator);
+    var stage2 = std.array_list.Managed(u5).init(allocator);
     defer stage2.deinit();
 
     var block: Block = [_]u5{0} ** block_size;
@@ -129,18 +132,17 @@ pub fn main() !void {
     _ = args_iter.skip();
     const output_path = args_iter.next() orelse @panic("No output file arg!");
 
-    const compressor = std.compress.flate.deflate.compressor;
+    var write_buf: [4096]u8 = undefined;
     var out_file = try std.fs.cwd().createFile(output_path, .{});
     defer out_file.close();
-    var out_comp = try compressor(.raw, out_file.writer(), .{ .level = .best });
-    const writer = out_comp.writer();
+    var writer = out_file.writer(&write_buf);
 
     const endian = builtin.cpu.arch.endian();
-    try writer.writeInt(u16, @intCast(stage1.items.len), endian);
-    for (stage1.items) |i| try writer.writeInt(u16, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage1.items.len), endian);
+    for (stage1.items) |i| try writer.interface.writeInt(u16, i, endian);
 
-    try writer.writeInt(u16, @intCast(stage2.items.len), endian);
-    for (stage2.items) |i| try writer.writeInt(u8, i, endian);
+    try writer.interface.writeInt(u16, @intCast(stage2.items.len), endian);
+    for (stage2.items) |i| try writer.interface.writeInt(u8, i, endian);
 
-    try out_comp.flush();
+    try writer.interface.flush();
 }