Error merging dict into a Dict[str, str]

[omry]

from dataclasses import dataclass, field
from typing import Dict
from omegaconf import OmegaConf


@dataclass
class JobConf:
    env: Dict[str, str] = field(default_factory=dict)


cfg = OmegaConf.create({"job": JobConf})
res = OmegaConf.merge(cfg, {"job": {"env": {"abc": "ABC"}}})
assert res.job == {"env": {"abc": "ABC"}}

Results in:

AssertionError: Unsupported value type : <class 'str'>
        full_key: job.env
        reference_type=Dict[str, str]
        object_type=dict

        full_key: job
        reference_type=Optional[JobConf]
        object_type=JobConf

        full_key: 
        reference_type=Optional[Dict[Any, Any]]
        object_type=dict