%NFACT bug

[David Hayden]

It appears to me that the System RPL entry %NFACT on my 50g doesn't work properly. This computes the factorial of a real number. Note that it's different from %FACT which computes gamma(x+1) and works correctly.

%NFACT appears to return IP(ABS(x))! There are 2 bugs

1. It doesn't honor system flag 22 when the result overflows. It returns 9.99999999999E499, even if the flag is clear
2. If x is between -1 and 1 (exclusive of the endpoints), it return 9.99999999999E499 instead of 1.
   

Hoping that someone can confirm or explain to me why I'm wrong.

Thanks,
Dave