SetMatcherEditor acts as a Blacklist or Whitelist filter, depending on its mode and a provided "MatchSet".
In Blacklist mode, the elements in the MatchSet are filtered out.
In Whitelist mode, the elements in the MatchSet are matched.
In Whitelist mode, an empty "MatchSet" can have two meanings:
match nothing or match all.
Therefore, the Whitelist functionality has to modes:
A provided function acts as an indirection to extract the value from a list element for comparison with the MatchSet.
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