hash: use ucnum for hash values everywhere.

One consequence of this is that we no longer pass negative
values to vecref; that functon was protecting us from the
consequences of this signed/unsigned mixup, at the cost of
cyles.

* hash.c (struct hash_ops): hash parameter in assoc_fun and
acons_new_c_fun pointers changes from cnum to ucnum.
(hash_assoc, hash_assql, hash_assq): hash parameter changes to
ucnum.
(hash_acons_new_c, hash_aconsql_new_c, hash_aconsq_new_c):
Likewise.
(gethash_c, gethash_e, remhash): Variable which captures the output of the hashing
function is now ucnum instead of cnum.

* lib.h (struct cons_hash_entry): Member hash changes from
cnum to ucnum.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib.h b/lib.h
index 7c8a582b..a57442a4 100644
--- a/lib.h
+++ b/lib.h
@@ -114,7 +114,7 @@ struct cons {
 struct cons_hash_entry {
   obj_common;
   val car, cdr;
-  cnum hash;
+  ucnum hash;
 };
 
 struct string {