




A single-float is an immediate object in 64-bit LispWorks,
A single-float is a boxed object in 32-bit LispWorks.
single-float is disjoint from double-float in all LispWorks implementations, version 5.0 and later.
single-float is disjoint from short-float in all 32-bit LispWorks implementations in version 5.0 and later. In 64-bit LispWorks single-float is the same type as short-float.
In LispWorks 4.4 and previous on Windows and Linux platforms, single-float is the same type as double-float. However, there are distinct specialized array types (array single-float), with single precision, and (array double-float), with double precision.
LispWorks User Guide and Reference Manual - 20 Sep 2017