P1690R1 Refinement Proposal for P0919 Heterogeneous lookup for unordered containers #3445
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Fixes #3406.
Also fixes NB US 235, US 236, PL 237, and US 238 (C++20 CD).
Fixes cplusplus/nbballot#232
Fixes cplusplus/nbballot#233
Fixes cplusplus/nbballot#234
Fixes cplusplus/papers#467