Feature: dataclass fields without a value can automatically indicate MISSING

[omry]

An historical decision was to enforce the usage of omegaconf.MISSING to indicate that a value is missing.

from omegaconf import MISSING

@dataclass
class User:
   name: str = MISSING

This creates a dependency on OmegaConf from the user dataclasses.
A better approach is to allow constructing OmegaConf configs from values that just does not specify the default value and convert it automatically to omegaconf.MISSING when constructing the config object to maintain the semantics.

@dataclass
class User:
   name: str