Double serialized as NaN, but without quotes, produce invalid json

[GoogleCodeExporter]

What steps will reproduce the problem?
1. This is kind of random, so just encode a lot of Double randomized value 
(very high or very low I guess)
2. convert using superObj := superRttiContext.AsJson<Type>(Data);
3. save using superObj.SaveTo(filePath);

What is the expected output?
The actual double value or "NaN" with quotes

What do you see instead?
NaN without quote like {"X": NaN}


What version of the product are you using? On what operating system?
Lastest version from repo (at this date)
Windows XP, Delphi 2010


Thanks.

Original issue reported on code.google.com by [email protected] on 27 Oct 2011 at 4:20