[bigforth] float.fb NAN

[Sergey Plis]

Sometimes I need to pass NAN to a function in C library. Bigforth's 
float.fb does not provide me with such constant. I am emulating the 
needed behaviour with:

: NAN ( -- f: NAN) $7FC00000 sp@ sf@ drop ;


May be it is worthwhile adding the functionality to float.fb?

Thanks!

--
Sergey

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