Accesses the readtable case of readtable, which affects the way in which the Lisp reader reads symbols and the way in which the Lisp printer writes symbols.
See section {\secref\ReadtableCaseReadExamples}\ and \secref\ReadtableCasePrintExamples.
None.
Should signal an error of type type-error if readtable is not a readtable. Should signal an error of type type-error if mode is not a case sensitivity mode.
copy-readtable copies the readtable case of the readtable.
\issue{READ-CASE-SENSITIVITY:READTABLE-KEYWORDS}