cake test: change `eq` to use egal semantics, paralleling `arrayEq`

Cakefile

@@ -164,7 +164,6 @@ runTests = (CoffeeScript) ->
   global[name] = func for name, func of require 'assert'
 
   # Convenience aliases.
-  global.eq = global.strictEqual
   global.CoffeeScript = CoffeeScript
 
   # Our test helper function for delimiting different test cases.
@@ -178,21 +177,23 @@ runTests = (CoffeeScript) ->
       e.source      = fn.toString() if fn.toString?
       failures.push filename: currentFile, error: e
 
-  # A recursive functional equivalence helper; uses egal for testing equivalence.
   # See http://wiki.ecmascript.org/doku.php?id=harmony:egal
-  arrayEqual = (a, b) ->
+  egal = (a, b) ->
     if a is b
-      # 0 isnt -0
       a isnt 0 or 1/a is 1/b
-    else if a instanceof Array and b instanceof Array
-      return no unless a.length is b.length
-      return no for el, idx in a when not arrayEqual el, b[idx]
-      yes
     else
-      # NaN is NaN
       a isnt a and b isnt b
 
-  global.arrayEq = (a, b, msg) -> ok arrayEqual(a,b), msg
+  # A recursive functional equivalence helper; uses egal for testing equivalence.
+  arrayEgal = (a, b) ->
+    if egal a, b then yes
+    else if a instanceof Array and b instanceof Array
+      return no unless a.length is b.length
+      return no for el, idx in a when not arrayEgal el, b[idx]
+      yes
+
+  global.eq      = (a, b, msg) -> ok egal(a, b), msg
+  global.arrayEq = (a, b, msg) -> ok arrayEgal(a,b), msg
 
   # When all the tests have run, collect and print errors.
   # If a stacktrace is available, output the compiled function source.