feat: generalize String.Slice.Pos.cast#12771
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TwoFX merged 2 commits intoleanprover:masterfrom Mar 3, 2026
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This PR generalizes
String.Slice.Pos.cast, which turns ans.Posinto at.Pos, to no longer requires = t, but merelys.copy = t.copy.This is a breaking change, but one that is easy to adapt to, by replacing
proofwithcongrArg Slice.copy proofwhere required.