Default value: (delivery-value :numeric)
If this is non-nil, all numeric functions that can handle complex numbers are retained.
Compatibility Note: This keyword has an effect on all platforms in LispWorks 5.0 and later. It has no effect in LispWorks 4.4 and previous on Windows and Linux platforms.
Affected by: :numeric
LispWorks Delivery User Guide - 10 Aug 2017