P1690 Refinement Proposal for P0919 Heterogeneous lookup for unordered containers

[wg21bot]

P1690R0 Refinement Proposal for P0919 Heterogeneous lookup for unordered containers (Xiao Shi, Mateusz Pusz, Geoffrey Romer)

[tituswinters]

Discussed in Cologne.

Forward to LWG for C++20.
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Should be prioritized, would be a break to do later.

[wg21bot]

P1690R1 Refinement Proposal for P0919 Heterogeneous lookup for unordered containers (Xiao Shi, Mateusz Pusz, Geoffrey Romer)

[mclow]

This was not adopted for C++20. Removing the "C++20" label.