omit_if_default ignores attrs' converters

[llovanto]

Hi! It seems like currently converter with omit_if_default=True does not apply attrs' converters when checking if the value is equal to the default one.

import attrs
import cattrs

c = cattrs.Converter(omit_if_default=True)


@attrs.define
class A:
    b: int = attrs.field(default="0", converter=int)


c.unstructure(A())
# {'b': 0}


@attrs.define
class A:
    b: int = attrs.field(default=0, converter=int)


c.unstructure(A())
# {}

Is this the expected behavior? If so, would you consider changing it?

[Tinche]

I hadn't really considered this. I'd be open to changing it.

[llovanto]

I hadn't really considered this. I'd be open to changing it.

Glad that you're open to changing it! I think i've managed to make it work, here's a pull request with my changes

#696