Catch Phpstan Up

[oleibman]

Its last few updates have been irksome. I need to eliminate more of the new problems with annotations rather than code because I can't figure out what it's objecting to. Nevertheless, it provides a very valuable service, so ...

Its latest release is flagging calling abs with a string, even when the string is defined as numeric-string in a doc block. Php generally allows it, though not with strict types. Changed to add 0 in those situations.

This is:

• [ ] a bugfix
• [ ] a new feature
• [ ] refactoring
• [ ] additional unit tests
• [x] code quality

Checklist:

• [ ] Changes are covered by unit tests
  • [x] Changes are covered by existing unit tests
  • [ ] New unit tests have been added
• [x] Code style is respected
• [x] Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• [ ] CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
• [ ] Documentation is updated as necessary

Why this change is needed?

Provide an explanation of why this change is needed, with links to any Issues (if appropriate). If this is a bugfix or a new feature, and there are no existing Issues, then please also create an issue that will make it easier to track progress with this PR.

[oleibman]

No idea what went wrong with Scrutinizer.