Sync modules to vendor/core

We haven't done this recently. Nothing has changed significantly, though
this does remove some files we weren't using.

src/vendor/core/$.js

@@ -21,16 +21,16 @@ var ge = require('ge');
 var ex = require('ex');
 
 /**
- * @param {string|DOMDocument|DOMElement|DOMTextNode} id
- * @return {DOMDocument|DOMElement|DOMTextNode}
- *
  * Find a node by ID.
  *
  * If your application code depends on the existence of the element, use $,
  * which will throw if the element doesn't exist.
  *
  * If you're not sure whether or not the element exists, use ge instead, and
  * manually check for the element's existence in your application code.
+ *
+ * @param {string|DOMDocument|DOMElement|DOMTextNode|Comment} id
+ * @return {DOMDocument|DOMElement|DOMTextNode|Comment}
  */
 function $(id) {
   var element = ge(id);

src/vendor/core/createArrayFrom.js

@@ -17,7 +17,46 @@
  * @typechecks
  */
 
-var hasArrayNature = require('hasArrayNature');
+/**
+ * NOTE: if you are a previous user of this function, it has been considered
+ * unsafe because it's inconsistent across browsers for some inputs.
+ * Instead use `Array.isArray()`.
+ *
+ * Perform a heuristic test to determine if an object is "array-like".
+ *
+ *   A monk asked Joshu, a Zen master, "Has a dog Buddha nature?"
+ *   Joshu replied: "Mu."
+ *
+ * This function determines if its argument has "array nature": it returns
+ * true if the argument is an actual array, an `arguments' object, or an
+ * HTMLCollection (e.g. node.childNodes or node.getElementsByTagName()).
+ *
+ * @param {*} obj
+ * @return {boolean}
+ */
+function hasArrayNature(obj) {
+  return (
+    // not null/false
+    !!obj &&
+    // arrays are objects, NodeLists are functions in Safari
+    (typeof obj == 'object' || typeof obj == 'function') &&
+    // quacks like an array
+    ('length' in obj) &&
+    // not window
+    !('setInterval' in obj) &&
+    // no DOM node should be considered an array-like
+    // a 'select' element has 'length' and 'item' properties on IE8
+    (typeof obj.nodeType != 'number') &&
+    (
+      // a real array
+      Array.isArray(obj) ||
+      // arguments
+      ('callee' in obj) ||
+      // HTMLCollection/NodeList
+      ('item' in obj)
+    )
+  );
+}
 
 /**
  * Ensure that the argument is an array by wrapping it in an array if it is not.

src/vendor/core/createObjectFrom.js

@@ -16,8 +16,6 @@
  * @providesModule createObjectFrom
  */
 
-var hasArrayNature = require('hasArrayNature');
-
 /**
  * Construct an object from an array of keys
  * and optionally specified value or list of values.
@@ -43,19 +41,19 @@ var hasArrayNature = require('hasArrayNature');
  */
 function createObjectFrom(keys, values /* = true */) {
   if (__DEV__) {
-    if (!hasArrayNature(keys)) {
+    if (!Array.isArray(keys)) {
       throw new TypeError('Must pass an array of keys.');
     }
   }
 
   var object = {};
-  var is_array = hasArrayNature(values);
+  var isArray = Array.isArray(values);
   if (typeof values == 'undefined') {
     values = true;
   }
 
   for (var ii = keys.length; ii--;) {
-    object[keys[ii]] = is_array ? values[ii] : values;
+    object[keys[ii]] = isArray ? values[ii] : values;
   }
   return object;
 }