make ams equation numbering more robust when `labels` object already contain tag

Created by: geyang

Hi,

I'm using math-jax dynamically and manually resets the equation numbers when I render each line.

I noticed that the ams package fails silently when the labels object already contains a key that the rerendered block has.

I need the labels object to contain all past objects so that my equation referencing can work. Would it be possible to add an option to make the amsmath package more robust in this case?

I have thought about it and this seems to be the best solution.

Thanks in advance!