Properly unwrap optional types during operations #28911
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Original PR: #28905
When optional types were used with unsuffixed literals in binary/unary ops, the literals were incorrectly inferred as the full optional type.
So, this adds unwrapping and wrapping back (when returning) to properly handle optional types in binary and unary ops, to get unsuffixed literals to correctly infer as T instead of T?.
Resolves: #28902