Describe the Bug

I'm trying to make an input filter option in Strawberry.

@strawberry.input
class FilterOptions:
    is_: Optional[bool] = strawberry.field(default=None, name="is")

As "is" is a reserved keyword in Python I can't use it as a field directly, so I alias it with strawberry.field(default=None, name="is")

However, if I do the above I get the following error:

TypeError: issubclass() arg 1 must be a class
pydantic/validators.py:751: TypeError

....

RuntimeError: error checking inheritance of <strawberry.type.StrawberryOptional object at 0x7f3503564dd0> (type: StrawberryOptional)

But If I make the field non-optional like below, it works:

@strawberry.input
class FilterOptions:
    is_: bool = strawberry.field(default=None, name="is")

System Information

• Operating system:
  • Ubuntu 22.04
• Strawberry version (if applicable):
  • 0.209.6

Additional Context