strtabString

pub fn strtabString(self: *Builder, bytes: []const u8) Allocator.Error!StrtabString {
    try self.strtab_string_bytes.ensureUnusedCapacity(self.gpa, bytes.len);
    try self.strtab_string_indices.ensureUnusedCapacity(self.gpa, 1);
    try self.strtab_string_map.ensureUnusedCapacity(self.gpa, 1);

    const gop = self.strtab_string_map.getOrPutAssumeCapacityAdapted(bytes, StrtabString.Adapter{ .builder = self });
    if (!gop.found_existing) {
        self.strtab_string_bytes.appendSliceAssumeCapacity(bytes);
        self.strtab_string_indices.appendAssumeCapacity(@intCast(self.strtab_string_bytes.items.len));
    }
    return StrtabString.fromIndex(gop.index);
}