[stdlib] String.UTF8View.index(_:offsetBy:limitedBy:): mark encoding of result #62859
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This marks the expected storage encoding of the index returned on the fast path of the UTF-8 view's
index(_:offsetBy:limitedBy:)method, ensuring index misuse can be detected on subsequent uses, and improving the display of the index during debugging.This was one path I missed during last year's String fixes.