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Determine the difference in constraints between two policies.
Since the compiler does not union constraints, there may be multiple
constraints with the same ruletype, object class, and permission
set, so constraints can only be added or removed, not modified.
The constraint expressions are compared only on a basic level.
Expressions that are logically equivalent but are structurally
different, for example, by associativity, will be considered
different. Type and role attributes are also not expanded,
so if there are changes to attribute members, it will not
be reflected as a difference.
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