Have list hashes depend on the order of the contents, as is the case for vectors. src/ChangeLog addition: 2008-01-16 Aidan Kehoe <kehoea@parhasard.net> * elhash.c (internal_hash): Make short lists with the same contents in a different order hash distinctly. Gives better performance for things like three-element lists describing colours. Thank you Sebastian Freundt! tests/ChangeLog addition: 2008-01-16 Aidan Kehoe <kehoea@parhasard.net> * automated/hash-table-tests.el: Assert that two short lists with the same contents in distinct orders hash differently.

--- a/tests/automated/hash-table-tests.el	Wed Jan 16 00:19:59 2008 +0100
+++ b/tests/automated/hash-table-tests.el	Wed Jan 16 15:20:51 2008 +0100
@@ -281,3 +281,4 @@
 ;;; Test sxhash
 (Assert (= (sxhash "foo") (sxhash "foo")))
 (Assert (= (sxhash '(1 2 3)) (sxhash '(1 2 3))))
+(Assert (/= (sxhash '(1 2 3)) (sxhash '(3 2 1))))