Also it is pretty much known that relativity isn't complete since both relativity and quantum mechanics have passed pretty much every experimental hurdle thrown at them but at certain key points of contact between them they disagree and produce gibberish.
So when they are eventually reconciled (if they are ever reconciled; and that is what string theory is, an attempt to bring them into a single theoretical framework) it is possible that the absolute limit of the speed of light will have some weird exceptions but I don't think that has been suggested by any serious theory so far.
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