class Google::Protobuf::FieldDescriptor

def options
  @options ||= begin
    size_ptr = ::FFI::MemoryPointer.new(:size_t, 1)
    temporary_arena = Google::Protobuf::FFI.create_arena
    buffer = Google::Protobuf::FFI.field_options(self, size_ptr, temporary_arena)
    opts = Google::Protobuf::FieldOptions.decode(buffer.read_string_length(size_ptr.read(:size_t)).force_encoding("ASCII-8BIT").freeze)
    opts.clear_features()
    opts.freeze
  end
end