Bound exponential inputs to avoid overflows

[c-randall]

Description

Use a clip to bound input to the exponential function in loadfns.Ramp2Constant to avoid OverflowWarning.

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that improves speed/readability/etc.)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ nox -s linter [-- format]
• Code is free of misspellings: $ nox -s codespell [-- write]
• All tests pass: $ nox -s tests
• Badges are updated: $ nox -s badges

The optional -- format and -- write arguments (see above) attempt to correct formatting issues prior to running the linter, and spelling mistakes prior to running the spellcheck, respectively. You can also run all of the above checks using $ nox -s pre-commit instead of running them individually.

Further checks:

• The documentation builds: $ nox -s docs.
• Code is commented, particularly in hard-to-understand areas.
• Tests are added that prove fix is effective or that feature works.