P3663R3 Future-proof submdspan_mapping
#8526
Open
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Fixes #8464
Fixes NB PL-009, US 66-117 (C++26 CD).
Also fixes cplusplus/papers#2292
Also fixes https://github.com/cplusplus/nbballot/issues/695
Also fixes https://github.com/cplusplus/nbballot/issues/818
Somehow relates to https://github.com/cplusplus/nbballot/issues/815 but I'm not sure how