Allowing [] input instead of '' in UpdateableAPIResource modify method

[JoJo10Smith]

I define a new function _format_values which looks through the entire params input of the modify method and will change all final instances of [] to "" (empty string) so that the user can input [] to empty the list instead of having to input an empty string.

This PR resolves issue #802

Please feel free to give feedback on the implementation/ any changes I could make to have this merged. I look forward to hearing feedback.
Thanks
Jordan

[CLAassistant]

All committers have signed the CLA.

[anniel-stripe]

Hi @JoJo10Smith, unfortunately we won't be accepting this PR at this time - this is a breaking change, as users who explicitly set a param to [] may have been relying, intentionally or not, on the library's no-op behavior. We're also unlikely to prioritize this change in the next major version, as we'd like to investigate this a bit more before applying a disruptive fix.

[JoJo10Smith]

Got it, thank you for the explanation @anniel-stripe