[Bug math/28322] Specify parsing of nan?

["joseph at codesourcery dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28322

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Note the oddity that the parsing of NaN payloads from strings can't handle 
integers larger than 64 bits (given the use of strtoull), when _Float128 
(long double on some architectures) has 111 payload bits and arguably 
strings corresponding to all possible 111-bit payloads should be parsed 
(so requiring adding code to glibc to handle parsing strings to 128-bit 
integers for this purpose - including on some architectures that don't 
have __int128 support).  That leads to the question of whether that oddity 
should be documented, or considered as a bug (or both).

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