Performs intersection (
md_intersect()) and union (
inter alia, messy date class objects.
For a more typical 'join' that retains all elements, even if duplicated,
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Messy date or other class objects
A vector of the same mode for
or a common mode for union.
md_intersect: Find intersection of sets of messy dates
md_union: Find union of sets of messy dates
md_multiset: Join two sets of messy dates
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