S.Boolean Typed.IReadOnlySet <T> .IsProperSubsetOf(Typed.IEnumerable <T> P) { foreach (var _ in P) { return(true); } return(false); }
S.Boolean Typed.IReadOnlySet <T> .IsProperSupersetOf(Typed.IEnumerable <T> P) => false;
S.Boolean Typed.IReadOnlySet <T> .SetEquals(Typed.IEnumerable <T> P) => (this as Typed.IReadOnlySet <T>).IsSupersetOf(other: P);
S.Boolean Typed.IReadOnlySet <T> .IsSubsetOf(Typed.IEnumerable <T> P) => true;
S.Boolean Typed.IReadOnlySet <T> .Overlaps(Typed.IEnumerable <T> P) => false;