Make applyPatches to accept readonly Patch[]

[Andarist]

My main goal is for applyPatches to accept readonly Patch[] as there is no reason why it shouldn't accept it. If you think that other changes here are too risky (like returning readonly Patch[] from produceWithPatches) then I can revert those bits of this change.

[mweststrate]

Yeah that looks great! I'm not 100% sure about the returned patches indeed, as people might be postprocessing those in a mutable manner. So probably safer to not change right away. (Feel free to set up a separate PR to park for the next major)

[mweststrate]

Looks like some of the tests fail, but overall agree with the idea :)

[Andarist]

@mweststrate I adjusted the PR as requested. There are still some test failures here but they are unrelated to the change - the same ones can be seen main

[mweststrate]

I didn't use GitHub for too long and can't find the rebase button anymore, but master should be fixed now.

[Andarist]

Just rebased this on top of main - it should be ready to go

[mweststrate]

Merging, thanks for the PR and sorry for the delay!

[github-actions]

🎉 This PR is included in version 10.1.1 🎉

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