Miscellanea fixes for optional#128

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steve-downey merged 3 commits intobemanproject:mainfrom

dangelog:P2988R12_misc_fixes

Jul 8, 2025

Commits on Jun 19, 2025

optional<T>::transform() const &&: move the value into the function
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Commits on Jul 1, 2025

optional::transform: ensure that it works with non-movable payloads
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optional<T&>::or_else: copy *this instead of creating a new optional
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