(or (delivery-value :keep-debug-mode)
((0 1) t)
This keyword controls the extent to which structure internals are shaken out of the image.
nil, all references from structure-objects to their conc-names, (BOA) constructors, copiers, slot names, printers and documentation are removed. See also :structure-packages-to-keep.
To retain slot name information (necessary if either the
#S() reader syntax or CLOS
slot-value are to be used for structure-objects) set
To retain slot names and the default structure printer, set
Note: Any functions (constructors, copiers or printers) referenced in the application are retained, just as any other code would be. It is therefore not normally necessary to set this keyword.
LispWorks Delivery User Guide - 10 Aug 2017