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I suppose this is http://dev.jquery.com/ticket/5081 , closed invalid. Can someone please either find a solution which the jQuery devs are willing to commit, or document this patch and any other patches so that we have some hope of doing an update from upstream without a regression?
Yes, this fix is not ideal in that it's the caller's responsibility to check it's passing valid values. However, when you've been hunting IE bugs all day and just want something to work, catching this in the callee is much easier than tracking down the callers passing invalid values (I think null is our fault, and NaN is jQuery UI's fault).
I can't find references to NaNpx or nullpx anywhere in trunk anymore. Assuming this was resolved in some refactor?
We updated jQuery to version 1.4, that'll have done it.
Marking resolved per r74326 and upstream fix.