fmt

pub fn fmt(self: *Builder, comptime fmt_str: []const u8, fmt_args: anytype) Allocator.Error!String {
    try self.string_map.ensureUnusedCapacity(self.gpa, 1);
    try self.string_bytes.ensureUnusedCapacity(self.gpa, @intCast(std.fmt.count(fmt_str, fmt_args)));
    try self.string_indices.ensureUnusedCapacity(self.gpa, 1);
    return self.fmtAssumeCapacity(fmt_str, fmt_args);
}