%*=%                    Multiplication variable reassignment
%+%                     Paste Infix Operator
%+=%                    Addition variable reassignment
%-=%                    Subtraction variable reassignment
%/=%                    Division variable reassignment
%^=%                    Exponentiation variable reassignment
%btwn%                  Between Infix Operator
%nand%                  NAND infix operator
%nin%                   Not-In Infix Operator
%xor%                   XOR infix operator
.is_allFalse            Tests if an object is entirely comprised of
                        'FALSE's
.is_allNA               Tests if a vector is entirely comprised of NAs
.is_length_zero         Tests if an object is of length 0
extended-null-default   Expanded default operator
null-default            Default NULL operator
