omry / omegaconf / b4c838a5-bc7f-477e-94e7-dc429a43c9c0

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Return literal None from OmegaConf.create(None)

OmegaConf.create(None) currently returns DictConfig(None), which makes
`OmegaConf.create(None) is None` false even though callers passed in the
literal None object. That behavior is surprising, differs from the input
identity, and forces callers to rely on equality checks or OmegaConf-specific
container semantics where a plain None was expected.

Change create() so an explicit None input returns literal None instead of
routing through the DictConfig construction path. Update the overloads to
reflect the new return type and add a regression test covering the identity
check. Document the behavior change in a news fragment because this is a
breaking change for code that relied on receiving DictConfig(None) from
OmegaConf.create(None).

Closes #1196

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