Support for PHP 8.4: Refactor implicitly nullable parameters

[pmccarren]

Hi! Thanks for your work on this project.

I noticed that some functions/methods use parameters with default null values without explicitly marking them as nullable. This pattern is deprecated as of PHP 8.4.

Example:

// Triggers deprecation in PHP 8.4
function example(string $param = null) { ... }

// Should be:
function example(?string $param = null) { ... }

It would be great to update these to avoid deprecation warnings in PHP 8.4 and beyond.

I’d be happy to help prepare a PR if that would be useful.

Thanks again!