human
I wrote the below code

    def SpecificSizer(field_number, is_repeated, is_packed):
        tag_size = _TagSize(field_number)
        if is_packed:
            local_VarintSize = _VarintSize
            def PackedFieldSize(value):
                result = (len(value) * value_size)
                return ((result + local_VarintSize(result)) + tag_size)
            return PackedFieldSize
        elif is_repeated:
            element_size = (value_size + tag_size)
            def RepeatedFieldSize(value):
                return (len(value) * element_size)
            return RepeatedFieldSize
        else:
            field_size = (value_size + tag_size)
            def FieldSize(value):
                return field_size
            return FieldSize
    return SpecificSizer

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def _FixedSizer(value_size):