remove host_field function.
rename mlen ->alen.
"macro lookup failed" message now traces.
boot array iterator.
host anew; remove prepend, append; use host function prefixes everywhere.
arr-iter-from.
is-iter-done -> iter-is-done.
use recur.
check getrusage return status.
host_id_hash; semantics of mod now match python.
obj_id_hash now returns Int.
host_is_ref.
cmpd_len, cmpd_field.
arr-resize, arr-map.
iso.
host_raise, utest.