yay or nay? Those methods would make sense for NSIndexSet: - [ ] ASTAll - [ ] ASTAny - [ ] ASTDifference - [ ] ASTEach - [ ] ASTEmpty - [ ] ASTFilter - [ ] ASTFind - [ ] ASTHead - [ ] ASTIntersection - [ ] ASTMap - [ ] ASTMin - [ ] ASTMax - [ ] ASTReduce - [ ] ASTReject - [ ] ASTSize - [ ] ASTTail - [ ] ASTUnion - [ ] ASTWithout