public class ExprFormatException
ExprFormatException is the exception thrown by the "asXXX()" methods of the Expr class
(e.g., asInt(), asDouble(), asArray(), etc.) These methods attempt to return a native Java
representation of the Expr's contents, and if this cannot be done because the Expr cannot
be represented in the requested form, an ExprFormatException is thrown. For example, if you
called asArray() on an Expr that held a String.