(if (delivery-value :keep-debug-mode) :default nil)
This keyword is deprecated in favor of :clos-initarg-checking.
The value of the
keyword controls whether
checks its initargs in the delivered application, and in LispWorks 6.1 this is extended to include checking in the other CLOS initializations.
now does the same comprehensive checking as :clos-initarg-checking but is deprecated as its name is no longer accurate. Please use :clos-initarg-checking instead.
Affected by: :keep-debug-mode
LispWorks Delivery User Guide - 13 Dec 2011