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Passing in ignore fails due to it being a valid option for uglifyify but not for terser preventing it from being used.
This would fail, with a list of patterns to ignore or even an empty list:
The change deletes the ignore option after checking it.
Also removed the use of xtend since when I looked at it to see if the deleting of a property would break something else the documentation for it made it very clear that it shouldn't be used.