Dict[str, Optional[str]] fails

[omry]

from dataclasses import *
from typing import *
from omegaconf import OmegaConf
@dataclass
class Foo:
    a : Dict[str, Optional[str]]

OmegaConf.structured(Foo)

Raises an assertion failure

[omry]

@pereman2, related to your ongoing work on better containers support.

[Jasha10]

I think this will require expanding what DictConfig._metadata can handle.

For example, DictConfig({}, element_type=str) works but DictConfig({}, element_type=Optional[str]) fails.

[omry]

Sounds right.