diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/compare-values.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/compare-values.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+load(libdir + "parallelarray-helpers.js");
+
+// Test that we are able to compare numbers even if the typesets are
+// not "clean" because we have previously added strings and numbers.
+// Also test that we distinguish between bools/numbers etc for strict
+// equality but not loose equality.
+
+function theTest() {
+  var ints = range(0, 1024);
+  var doubles = ints.map(v => v + 0.1);
+  var bools = ints.map(v => (v % 2) == 0);
+  var strings = ints.map(v => String(v));
+
+  function looselyCompareToDoubles(e, i) {
+    return doubles[i] == e;
+  }
+  print("doubles");
+  assertArraySeqParResultsEq(doubles, "map", looselyCompareToDoubles);
+  print("bools");
+  assertArraySeqParResultsEq(bools, "map", looselyCompareToDoubles);
+  // ion bails out when converting a string to a double right now,
+  // so par exec cannot proceed
+  print("strings");
+  assertParallelExecWillBail(function (mode) {
+    strings.mapPar(looselyCompareToDoubles, mode)
+  });
+  print("ints");
+  assertArraySeqParResultsEq(ints, "map", looselyCompareToDoubles);
+
+  function strictlyCompareToDoubles(e, i) {
+    return doubles[i] === e;
+  }
+  print("doubles, strict");
+  assertArraySeqParResultsEq(doubles, "map", strictlyCompareToDoubles);
+  print("bools, strict");
+  assertArraySeqParResultsEq(bools, "map", strictlyCompareToDoubles);
+  print("strings, strict");
+  assertArraySeqParResultsEq(strings, "map", strictlyCompareToDoubles);
+  print("ints, strict");
+  assertArraySeqParResultsEq(ints, "map", strictlyCompareToDoubles);
+}
+
+if (getBuildConfiguration().parallelJS)
+  theTest();