RFC: std.json sucessor

[via Digitalmars-d]

Kahan states this in a 1997 paper:

«[…]An SNaN may be moved ( copied ) without incident, but any 
other arithmetic operation upon an SNaN is an INVALID operation ( 
and so is loading one onto the ix87's stack ) that must trap or 
else produce a new nonsignaling NaN. ( Another way to turn an 
SNaN into a NaN is to turn 0xxx...xxx into 1xxx...xxx with a 
logical OR.) Intended for, among other things, data missing from 
statistical collections, and for uninitialized variables[…]»

( http://www.eecs.berkeley.edu/~wkahan/ieee754status/IEEE754.PDF)

x87 is legacy, it predates IEEE754 by 5 years and should be 
forgotten.

Note also that the string representation for a signalling nan is 
"NANS", so it reasonable to save it to file if you need to 
represent missing data. "NAN" represents 0/0, sqrt(-1), not 
missing data.

I'm not really sure how it can be interpreted differently?

Ola.