intersection method
Implementation
@override
EnumSet<FollowValue> intersection(EnumSet<FollowValue> other) =>
    FollowValueEnumSet.fromRawValue(this.rawValue & other.rawValue);@override
EnumSet<FollowValue> intersection(EnumSet<FollowValue> other) =>
    FollowValueEnumSet.fromRawValue(this.rawValue & other.rawValue);