The signed sized integer types.
FLI types are defined for integers of particular sizes. These are equivalent to the types defined by ISO C99. For example, Lisp
is ISO C99 int8_t.
The types have these meanings:
8-bit signed integer
16-bit signed integer
32-bit signed integer
64-bit signed integer
The largest type of signed integer available
A signed integer the same size as a pointer
LispWorks Foreign Language Interface User Guide and Reference Manual - 21 Dec 2009