Not listed tweening parameter "shift" throws exception for addTween()

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Q. What is the expected outcome? What happens instead?

Expected outcome: tweening arbitrary object's "shift" parameter to a desired 
value. Object is not an instance of Array. It has it's own getter/setter pait 
called "shift". Note that renaming "shift" to "shift1" solves the problm. 
However "shift" is not a listed parameter of tween parameters list, so it's 
expected that it's behavior is standard.

What happens:
Main Thread (Suspended: ReferenceError: Error #1037: Cannot assign to a method 
shift on Array.)
    caurina.transitions::Tweener$/addTween  
    ...

Q. What code will reproduce the problem?

Tweener.addTween(someObjectWithShiftProperty, {time: 1, shift: 9001});

Q. What version of the class are you using, and under which development 
environment (IDE version, compiler, etc)?

Version 1.33.74
Standalone Flash Builder 4 Premium on Mac.

Please provide any additional information below. Also, please attach *small*, 
sample files with minimum functionality to reproduce the problem if possible.

Original issue reported on code.google.com by rawmant...@gmail.com on 20 Jan 2012 at 3:23

Attachments:

• TweenerTest.as