To not override ref/out if was modified to same value #1251
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Be more strict on detecting whether the boxed struct value was modified. If we find that user rewrote the value to self (or e.g. re-assigned complex struct which has shallow equality), we should not override the value with auto-generated.
Found this issue when was writing tests with intense usage of
ref/out.@aivascu Thank you for the review. It's a small and almost trivial fix, so I don't expect it to break things.