The following code block functions correctly in 1.6.4 but performs incorrectly in 1.7, 1.7.1 and 1.7.2rc1

var Human = function () {
    $(this).unbind('speak').bind('speak', function (e) {
        $(this).trigger('beforespeak');
        console.log('base speak');
    });

    $(this).unbind('beforespeak').bind('beforespeak', function (e) {
        console.log('base beforespeak');
    });


    this.onspeak = function (e) {
        console.log('base onspeak');
    };

    this.onbeforespeak = function (e) {
        console.log('base onbeforespeak.  I should be called only when Human is instantiated but not when Worker instantiates since this should be overridden in Worker.');
    };
};

var Worker = function() {
    $(this).bind('speak', function (e) {
        console.log('derived speak');
    });

    this.onspeak = function (e) {
        console.log('derived onspeak');
    };

    $(this).bind('beforespeak', function (e) {
        console.log('derived beforespeak');
    });

    this.onbeforespeak = function (e) {
        console.log('derived onbeforespeak.  I should be called instead of base onbeforespeak.  Immediately after base and derived beforespeak events.');
    };
};

Worker.prototype = new Human();
Worker.prototype.constructor = Worker.prototype;

var w = new Worker();
$(w).trigger('speak');

Expected console output:

base beforespeak
derived beforespeak
derived onbeforespeak. I should be called instead of base onbeforespeak. Immediately after base and derived beforespeak events.
base speak
derived speak
derived onspeak

1.7x console output:

base beforespeak
derived beforespeak
base onbeforespeak. I should be called only when Human is instantiated but not when Worker instantiates since this should be overridden in Worker.
base speak
derived speak
derived onspeak

Summary:

When adding a sequence of event callbacks and overriding a base object's event, the base object's event is called in error instead of the override in the derived object.