Pydantic: How to use `Union` without type conversion?

[vanyakosmos]

Question

How to use Union without type conversion?

import pydantic
from typings import Union

class Foo(pydantic.BaseModel):
  foo: Union[int, float]

assert isinstance(Foo(foo=1.1), float), "will throw an error"

I know that I can flip Union[float, int], but now all foo will always be floats.

[samuelcolvin]

There's no way currently, you need to wait until #619 or the change I just suggested on #1423.