[2026-03 LWG Motion 22] P3450R1 Extend std::is_within_lifetime#8881
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std::is_within_lifetimestd::is_within_lifetime
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Fixes NB US 82-145 (C++26 CD).
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Fixes #8856
Fixes NB US 82-145 (C++26 CD).
Also fixes https://github.com/cplusplus/nbballot/issues/724
Also fixes cplusplus/papers#2113