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 microAl...@gmail.com on 27 Oct 2011 at 4:20