[ 2020-10-02; status to Open ]
Previous resolution [SUPERSEDED]:
This wording is relative to N4861.
Modify [namespace.std] as indicated:
-7- Other than in namespace std or in a namespace within namespace std, a program may provide an overload for any library function template designated as a customization point, provided that (a) the overload's declaration depends on at least one user-defined type and (b) the overload meets the standard library requirements for the customization point. (footnote 173)
[Note: This permits a (qualified or unqualified) call to the customization point to invoke the most appropriate overload for the given arguments. — end note]