Moosex::types::set::object provides moose type constraint (see moosex::types and moose::util::typeconstraints) that is a set::object, with coercions. it is essentially a collection of unordered objects without duplication (see set theory in mathematics).

similarly, it allows one to operate on these sets - determining their union, intersection, difference and symmetric difference in a trivial way. there are many more operations, which are discussed in set::object's documentation.