Warning: "from __future__ import annotations" breaks "from_dict"

[Ogaday]

eg:

from __future__ import annotations

from dataclasses import dataclass

from howard import from_dict, to_dict


@dataclass
class Number:
    value: int


d = {'value': 1}
from_dict(d, Number)
# TypeError: Unsupported type int

The error message is strange, because of course ints are supported! Here's what's actually happening: The Field object, who's type attribute we inspect as part of the loading routine, is usually a genuine python type. When annotations is imported, that attribute becomes a string representing the type instead.

from dataclasses import fields

fields(Number)[0].type
# 'int'

I'm not sure how to fix this, so I'm just leaving this issue here.

There is an issue on the Python bug tracker here, but it doesn't look very positive.