#15 Boolean cause Unknown exception

[Joris Nobre]

I have a bug with 1.22 I hadn't with 1.21 concerning boolean values.
I tried this very simple JSON sample and got "Unknown exception". By removing the "useJSP" entry (which is a boolean), it works. However, this sample worked with 1.21 (I guess the fix about boolean display in 1.22 is the cause of this bug).

{
    "config": "Philadelphia",
    "useJSP": false,
    "maxLength": 500
}