thanks to @cache-missing for the report!

This:

import strawberry

@strawberry.input
class InputData:
    name: str = "10"

@strawberry.type
class Query:
    @strawberry.field
    def example(self, data: InputData = InputData()) -> str:
        return data.name

schema = strawberry.Schema(query=Query)

Results in an error when not passing anything to data:

argument of type 'InputData' is not iterable

GraphQL supports non scalar types as input (they also show up in the schema), while in python you'd usually use None/UNSET as default. We should support this use case, by either adding direct support for default values or by providing a default factory.

Here's an example on the playground