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a generalized boolean.
implementation-dependent.
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.
The implementation.