Return non-finite floats unchanged from naturaldelta

[uttam12331]

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:

exceptOverflowError:
ifnotmath.isfinite(value):
returnstr(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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.56%. Comparing base (3c577d7) to head (99e251f).

Additional details and impacted files

@@ Coverage Diff @@## main #334 +/- ##
=======================================
Coverage 99.56% 99.56% =======================================
Files 12 12 Lines 913 925 +12 =======================================
+ Hits 909 921 +12 
Misses 4 4 

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[codspeed-hq]

Merging this PR will not alter performance

✅ 15 untouched benchmarks

---

_{Comparing uttam12331:fix/333-naturaldelta-inf (99e251f) with main (3c577d7)}

[hugovk]

Thanks, just a couple of suggestions.

[hugovk]

Let's parameterise:

Suggested change

	deftest_naturaldelta_non_finite() ->None:
	"""Non-finite floats are returned unchanged instead of raising (#333)."""
	asserthumanize.naturaldelta(float("nan")) =="nan"
	asserthumanize.naturaldelta(float("inf")) =="inf"
	asserthumanize.naturaldelta(float("-inf")) =="-inf"
	@pytest.mark.parametrize("value, expected", [
	(float("nan"), "nan"), (float("inf"), "inf"), (float("-inf"), "-inf"),
	])
	deftest_naturaldelta_non_finite() ->None:
	"""Non-finite floats are returned unchanged instead of raising."""
	asserthumanize.naturaldelta(value) ==expected

[hugovk]

Let's defer this so it's not imported if not needed.

Please move it inside the except OverflowError: block.