Find the (asymmetric) difference between two collections of objects
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the first collection to consider.
the second collection to consider.
additional arguments passed to methods
Note that setdiff.default calls base::setdiff to ensure consistent behaviour for regular vectors.
As a convenience
y, the second
collection, to be a character vector of names.
A collection of the same mode as
x that contains all elements
x that are not present in
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