Multiple "Format String Issue" warnings in JSONKit.m after upgrading to PhoneGap 2.0 on iOS
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We just upgraded to PhoneGap/Cordova 2.0 on iOS, but we're seeing multiple warnings in JSONKit.m.

There are two classes of warnings: (1) "Format String Issue" and (2) "Semantic Issue."

Here is an example of the "Format String Issue":

    /Users/macuser/Documents/CordovaLib/Classes/JSON/JSONKit.m:745:180: Format specifies type 'unsigned long' but the argument has type 'NSUInteger' (aka 'unsigned int')

Here is an example of the "Semantic Issue":

    /Users/macuser/Documents/CordovaLib/Classes/JSON/JSONKit.m:2600:11: Direct access to objective-c's isa is deprecated in favor of object_setClass() and object_getClass()

We're on Lion, Xcode 4.4.

Any clues why this warnings are happening now whereas they didn't before?

Thanks!
