always slice spread literals

test/fixtures/syntax/spread/array-literals/expected.js

@@ -1,5 +1,7 @@
+var _slice = Array.prototype.slice;
+
 var lyrics = [
   "head",
   "and",
   "toes"
-].concat(parts);
+].concat(_slice.call(parts));

test/fixtures/syntax/spread/contexted-method-call-multiple-args/expected.js

@@ -1,8 +1,9 @@
+var _slice = Array.prototype.slice;
 foob.add.apply(foob, [
   foo,
   bar
-].concat(numbers));
+].concat(_slice.call(numbers)));
 foob.test.add.apply(foob.test, [
   foo,
   bar
-].concat(numbers));
+].concat(_slice.call(numbers)));

test/fixtures/syntax/spread/contexted-method-call-single-arg/expected.js

@@ -1,2 +1,3 @@
-foob.add.apply(foob, numbers);
-foob.test.add.apply(foob.test, numbers);
+var _slice = Array.prototype.slice;
+foob.add.apply(foob, _slice.call(numbers));
+foob.test.add.apply(foob.test, _slice.call(numbers));

test/fixtures/syntax/spread/method-call-multiple-args/expected.js

@@ -1,4 +1,5 @@
+var _slice = Array.prototype.slice;
 add.apply(null, [
   foo,
   bar
-].concat(numbers));
+].concat(_slice.call(numbers)));

test/fixtures/syntax/spread/method-call-single-arg/expected.js

@@ -1 +1,2 @@
-add.apply(null, numbers);
+var _slice = Array.prototype.slice;
+add.apply(null, _slice.call(numbers));