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Standard diff of two sets.
Parameters:
left An iterable
right An iterable
Return:
tuple (added, removed, matched)
added Set of items in right but not left
removed Set of items in left but not right
matched Set of items in both left and right. This is
in the form of tuples with the matching item
from left and right
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General wrapper for policy symbols, e.g. types, roles
to provide a diff-specific equality operation based
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