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The end parameter on SourceBuffer.remove() is currently declared as double. I'm proposing to change this to an unrestricted double so that applications can do something like sourceBuffer.remove(5, Number.POSITIVE_INFINITY) to remove everything after 5 seconds. If the end parameter is NaN or NEGATIVE_INFINITY then remove() will throw an INVALID_ACCESS_ERR.
Changes committed https://dvcs.w3.org/hg/html-media/rev/3e8dfccbfded