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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.
Section 2.4.8.3 (Sharpsign Left-Parenthesis), Section 2.4.8.20 (Sharpsign Less-Than-Sign)