Fix/strict nullables

[eelkevdbos]

Closes #2038

[murraycollingwood]

Can we skip the php 7.4 tests and release this please?

PHP 7.4 was released on November 28, 2019. Its end-of-life (EOL) date, meaning no more bug or security fixes, was November 28, 2022.

I'm setting up a new machine and we're moving immediately to php 8.4

Alternatively, is there anything I can do to help this along? I've not contributed before, but there probably are some simple "type" errors that I could help with.

[eelkevdbos]

Can we skip the php 7.4 tests and release this please?

I would have no problem with that.

Alternatively, is there anything I can do to help this along? I've not contributed before, but there probably are some simple "type" errors that I could help with.

I'm patching one file per commit for easy rollback / cherry picking, but I'm not really sure if there is a faster way without having conflicts because of overlapping work. I'll try to finish the nullable warnings this week.

[mringler]

I think most of those are fixed in #2019.

Let me know when you are finished, I am happy to merge this into perpl (I don't think this repository is actively maintained anymore).

[smhg]

@eelkevdbos would you be able to rebase this PR please?
#2019 got merged and tests are fixed. So rebasing will give us a clear picture of what remains.
Thanks!

[eelkevdbos]

@eelkevdbos would you be able to rebase this PR please?
#2019 got merged and tests are fixed. So rebasing will give us a clear picture of what remains.
Thanks!

Done!