diff --git a/contrib/revsetbenchmarks.txt b/contrib/revsetbenchmarks.txt
--- a/contrib/revsetbenchmarks.txt
+++ b/contrib/revsetbenchmarks.txt
@@ -23,5 +23,6 @@ draft()
 max(::(tip~20) - obsolete())
 roots((0:tip)::)
 (not public() - obsolete())
+(_intlist('20000\x0020001')) and merge()
 parents(20000)
 (20000::) - (20000)
diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -1911,7 +1911,7 @@ def optimize(x, small):
             w = 100 # very slow
         elif f == "ancestor":
             w = 1 * smallbonus
-        elif f in "reverse limit first":
+        elif f in "reverse limit first _intlist":
             w = 0
         elif f in "sort":
             w = 10 # assume most sorts look at changelog