defineAbbrev

                pub fn defineAbbrev(self: *Self, comptime ops: []const AbbrevOp) Error!void {
                    const bitcode = self.bitcode;
                    try bitcode.writeBits(2, abbrev_len);

                    // ops.len is not accurate because arrays are actually two ops
                    try bitcode.writeVbr(blk: {
                        var count: usize = 0;
                        inline for (ops) |op| {
                            count += switch (op) {
                                .literal, .fixed, .fixed_runtime, .vbr, .char6, .blob => 1,
                                .array_fixed, .array_fixed_runtime, .array_vbr, .array_char6 => 2,
                            };
                        }
                        break :blk count;
                    }, 5);

                    inline for (ops) |op| {
                        switch (op) {
                            .literal => |value| {
                                try bitcode.writeBits(1, 1);
                                try bitcode.writeVbr(value, 8);
                            },
                            .fixed => |width| {
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(1, 3);
                                try bitcode.writeVbr(width, 5);
                            },
                            .fixed_runtime => |width_ty| {
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(1, 3);
                                try bitcode.writeVbr(bitcode.getTypeWidth(width_ty), 5);
                            },
                            .vbr => |width| {
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(2, 3);
                                try bitcode.writeVbr(width, 5);
                            },
                            .char6 => {
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(4, 3);
                            },
                            .blob => {
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(5, 3);
                            },
                            .array_fixed => |width| {
                                // Array op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(3, 3);

                                // Fixed or VBR op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(1, 3);
                                try bitcode.writeVbr(width, 5);
                            },
                            .array_fixed_runtime => |width_ty| {
                                // Array op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(3, 3);

                                // Fixed or VBR op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(1, 3);
                                try bitcode.writeVbr(bitcode.getTypeWidth(width_ty), 5);
                            },
                            .array_vbr => |width| {
                                // Array op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(3, 3);

                                // Fixed or VBR op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(2, 3);
                                try bitcode.writeVbr(width, 5);
                            },
                            .array_char6 => {
                                // Array op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(3, 3);

                                // Char6 op
                                try bitcode.writeBits(0, 1);
                                try bitcode.writeBits(4, 3);
                            },
                        }
                    }
                }