a generalized boolean.
Controls the format in which arrays are printed. If it is false, the contents of arrays other than strings are never printed. Instead, arrays are printed in a concise form using #< that gives enough information for the user to be able to identify the array, but does not include the entire array contents. If it is true, non-string arrays are printed using #(...), #*, or #nA syntax.
Section 18.104.22.168 (Sharpsign Left-Parenthesis), Section 22.214.171.124 (Sharpsign Less-Than-Sign)