Add ability to specify infinity and NaN strings about ryu HOT 2 OPEN

I generally agree, but I haven't found a nice way to do that.

from ryu.

Would something like this work?
#if !defined(RYU_MEMCOPY_NAN)
#define RYU_MEMCOPY_NAN int memcpy_nan( char * dest_) { memcpy( dest_, "nan", 3 ); return 3; }
#endif
RYU_MEMCOPY_NAN

#if !defined(RYU_MEMCOPY_INF)
#define RYU_MEMCOPY_INF int memcpy_infinity( char * dest_) { memcpy( dest_, "Infinity", 8 ); return 8; }
#endif
RYU_MEMCOPY_INF

#if !defined(RYU_EXPONENT)
#define RYU_EXPONENT 'e'
#endif

...and use memcpy_nan/memcpy_infinity/RYU_EXPONENT where appropriate?

from ryu.