Conses are allocated in standard frob blocks. The only thing to
note is that conses can be explicitly freed using
and associated functions
immediately puts the conses onto the cons free list, and decrements
the statistics on memory allocation appropriately. This is used
to good effect by some extremely commonly-used code, to avoid
generating extra objects and thereby triggering GC sooner.
However, you have to be extremely careful when doing this.
If you mess this up, you will get BADLY BURNED, and it has happened