Ext.Function.createInterceptor can't return false value for intercepted method

[aleksandy]

REQUIRED INFORMATION

Ext version tested:

• Ext 4.*

Description:
Ext.Function.createInterceptor can't return false value for intercepted method. Because of this compare with false thru === is failed

Steps to reproduce the problem:
Execute code from test case.

The result that was expected:

f0
hello
f0Interceptor
hello

The result that occurs instead:

f0
hello
f0Interceptor

Test Case:

var hello = function() {
    console.log('hello');
},
f0 = function() {
    console.log('f0');
    return false;
};
if (f0() === false) {
    hello();
}

f0 = Ext.Function.createInterceptor(f0, function() {
    console.log('f0Interceptor');
    return false;
}, this, false);

if (f0() === false) {
    hello();
} else {
    throw new Error("Interceptor fail");
} 

HELPFUL INFORMATION

Possible fix:

Ext.apply(Ext.Function, {
    createInterceptor: function(origFn, newFn, scope, returnValue) {
        var method = origFn;
        if (!Ext.isFunction(newFn)) {
            return origFn;
        } else {
            returnValue = Ext.isDefined(returnValue) ? returnValue : null; 
            return function() {
                var me = this,
                    args = arguments;
                newFn.target = me;
                newFn.method = origFn;
                return (newFn.apply(scope || me || Ext.global, args) !== false) ? origFn.apply(me || Ext.global, args) : returnValue;
            };
        }
    }
});