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Completely remove Collection/ReadonlyCollection types
Split out of #51921 to constrain it to more valuable changes.
@jakebailey Same here; let's merge this for 5.1 if that last comment isn't a concern.
I think it's a concern, in that if it's order dependent now, it might break in the future if the order internally changes somehow. So, I'd like the bug to be looked at first.
Closing this since there's no way I'd want to merge this before #52313 is fixed, which itself looks to be a challenging bug.