If this is non- nil , Delivery retains the full TTY debugger, so it can be used when debugging delivered applications.
On Unix, if the value is :all , all debug information is kept
On all platforms, if :keep-debug-mode is set to :keep-packages , all packages are retained as well as the debugger, so that they can be used for debugging purposes.
The debugger is retained by setting the keyword :compact to nil and the following keywords to t :
:keep-clos-object-printing
:keep-eval
:keep-function-name
:keep-lexer
:keep-lisp-reader
:keep-load-function
:keep-modules
:keep-structure-info
:keep-top-level
:keep-walker
:top-level-listener-p