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Whilst looking through the codebase's event handling logic I found this property that doesn't seem to be used or documented. Here is the Github search result:
As you can see from the image above, it's only referenced four times in the codebase, and only once in a file that isn't for testing.
I may be mistaken but it doesn't actually seem to be used for anything as it's replaced by keyIsDown which is documented.
This brings up the question, is there any point keeping track of this variable and should it be removed (I think it should as there's no point keeping it).