Updated the object serialization logic and removed deprecation warning

[danielmorell]

Description of the change

This commit cleans up the object serialization logic. Notably, it removes a deprecation warning that really should never have been there in the first place. I feel free to say that because I am the one who put it there. It mirrors the built in deprecation warning that PHP itself gives and is unnecessary.

We have split the serialization into internal and external logic we can easily ensure we are correctly serializing each object.

I also added a few comments to explain some of the bits of code that are not obvious.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

Related issues

None

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers assigned
• Issue from task tracker has a link to this pull request
• Changes have been reviewed by at least one other engineer

[waltjones]

👍