An R object may have a class attribute that is a character
vector giving the names of classes it inherits from. stripClass
strips the class classString from that character vector.
stripTis(x) is shorthand for stripClass(x, "tis").
stripClass(x, classString)
stripTis(x)an object whose class character vector may or may not
include classString
name of class to remove from the inheritance chain
An object like x, but whose class attribute does
not include classString. If the class attribute less
classString is empty, unclass(x) is returned.