[2026-03 LWG Motion 18] P3961R1 Less double indirection in function_ref (RU-220)#8901
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Fixes NB RU 220 (C++26 CD). Editorial note: * The value of the feature test macro __cpp_lib_function_ref is increased to 202604, since it has already been increased by a prior motion in this meeting, and implementers expressed interest in a separate value. * Use code, not English, to expresss the conjunction in the definition of is-convertible-from-specialization.
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Fixes #8852
Also fixes cplusplus/papers#2608
Also fixes cplusplus/nbballot#790