Stopping chained tweens?

[Leander1P]

We changed stop in tween.js to this, to stop all tweens in a chain:

        stop: function () {
            if ( !this._chained ) {
                this.playing = false;
                this.stopped = true;
            }
            else {
                // Chained.  Iterate, tracking what we've seen (to avoid infinite loops).
                // Could use a chase-pointer, but the list is likely to
                // be short, and we'll avoid extra stops this way,
                // but likely take extra GC load due to the array.
                var seen = [];
                for ( var cur = this; cur && seen.indexOf(cur) === -1; cur = cur._chained ) {
                    cur.playing = false;
                    cur.stopped = true;
                    seen.push( cur );
                }                
            }
        },

Posting this more or less as a "Request for Comment".

We ran into a few cases where devs assumed stopping the head of a chain would stop the rest, and bugs resulted. I could see arguing for a separate stopChain or similar, and the singly-linked nature of the chain makes the prospect of stopping something mid-chain a little wonky, so -- not sure what I think about this generally. But we're likely to ship with it for at least one game, so it seemed worth bumping upstream for comment.