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Commit df2be92 breaks CPComparisonPredicate if one side of the comparison is a property which returns a BOOL.
CPPredicateParser parses literal BOOLs (YES/NO) into 0/1 using CPNumber>>numberWithBool:. CPComparisonPredicate however does not cast a BOOL from a property using numberWithBool:. E.g.
[[YES,NO] filteredArrayUsingPredicate:[CPPredicate predicateWithFormat:'self = YES']]
used to return [true], now it returns [].
This fix addresses the issue by "typecasting" the lhs/rhs values to numbers using CPNumber>>numberWithBool: if they are of type boolean.
Fixes #2028