in op - remove check to support sparse arrays

Author: gkz

lib/ast.js

@@ -2677,9 +2677,9 @@ UTILS =
     return r;
   }'''
 
-  in: '''function(x, arr){
-    var i = -1, l = arr.length >>> 0;
-    while (++i < l) if (x === arr[i] && i in arr) return true;
+  in: '''function(x, xs){
+    var i = -1, l = xs.length >>> 0;
+    while (++i < l) if (x === xs[i]) return true;
     return false;
   }'''
 

lib/browser.js

@@ -85,7 +85,6 @@ eq true, 4 not in array
 eq true, 1 not in []
 eq true, [3]pop() in [0, ...array]
 eq true, [4]pop() in [...array, 4]
-ok void not in length: 1
 
 eq 1, +( 0 in [0])
 eq 0, +(10 in [ ])