Hi @tpdorsey! Could you help me understand what you meant by this diff? It looks to me like the current support for extra="allow" is the same as it was after #2557 (the PR where the removed copy was introduced), but I'm wondering if I'm missing something.

With extra="allow", extra values passed to __init__ still end up in the instantiated object, but just aren't surfaced via __str__. Example script:

from pydantic.dataclasses import dataclass

@dataclass(config=dict(extra="allow"))
class Example:
    ...

obj = Example(a=1, b=2)
print(obj)
print(f"Extra: a={obj.a}, b={obj.b}")

This script yields the following output when running with the latest pydantic==2.3.0:

Example()
Extra: a=1, b=2

Hey, Could you please make an issue or ask this in a GitHub discussion?

Thanks for the quick response, @hramezani — opened #7362 to discuss.