Handle float singular counts

[Mirochill]

Summary

• treat numeric counts equal to 1 (including 1.0) as singular in get_count()
• preserve the existing bool behavior so True is not silently reclassified as a numeric singular count
• add a focused regression case and changelog note

References

• Fixes get_count returns 2 when the float 1.0 is passed in, this leads to bad pluralizations if you have a float input #232

Validation

• Not run locally
• relying on the repository's GitHub Actions checks for remote validation