Summary

Closes #333.

naturaldelta()'s docstring says values it cannot convert to a timedelta are returned unchanged, and float("nan") already is. But float("inf") / float("-inf") raised an uncaught OverflowError (from int(value)) instead of being returned unchanged like nan:

>>> humanize.naturaldelta(float("nan"))
'nan'
>>> humanize.naturaldelta(float("inf"))
OverflowError: cannot convert float infinity to integer   # before
'inf'                                                      # after

Fix

Catch OverflowError and return the value unchanged only when it is non-finite. A too-large finite value — whose OverflowError comes from timedelta(seconds=...) — is still re-raised, preserving the documented Raises: OverflowError contract:

except OverflowError:
    if not math.isfinite(value):
        return str(value)
    raise

Tests

• test_naturaldelta_non_finite — asserts nan/inf/-inf return "nan"/"inf"/"-inf".
• test_naturaldelta_too_large_value_raises — locks in that a too-large finite value (1e30) still raises OverflowError.

Verified locally: pytest tests/test_time.py → 385 passed; ruff check clean.