And from KDE as well, through Qt's Qt Declarative libraries that use QML. Judging by the Qt source, if the internal JS runtime JSON parser is used then it will

And from KDE as well, through Qt's Qt Declarative libraries that use QML. Judging by the Qt source, if the internal JS runtime JSON parser is used then it will not support full range of 64-bit integers, since the double floating point type is used for any integers x where abs(x) > 1^^25.