.FrozenSet = 'frozenset': ClassType
.FrozenSet.
    copy: (self: .FrozenSet) -> .FrozenSet
    difference: (self: .FrozenSet, *args: .FrozenSet) -> .FrozenSet
    intersection: (self: .FrozenSet, *args: .FrozenSet) -> .FrozenSet
    isdisjoint: (self: .FrozenSet, other: .FrozenSet) -> Bool
    issubset: (self: .FrozenSet, other: .FrozenSet) -> Bool
    issuperset: (self: .FrozenSet, other: .FrozenSet) -> Bool
    symmetric_difference: (self: .FrozenSet, other: .FrozenSet) -> .FrozenSet
    union: (self: .FrozenSet, *args: .FrozenSet) -> .FrozenSet