A variable’s type and width are the type and width of its values (see Values).
Returns the type of variable var.
Returns the width of variable var.
Sets the width of variable var to width. The width of a variable should not normally be changed after the variable is created, so this function is rarely used. This function cannot be applied to a variable that is part of a dictionary.
Returns true if var is a numeric variable, false otherwise.
Returns true if var is an alphanumeric (string) variable, false otherwise.