docs: fast forward to latest master.

docs/common.md

@@ -24,6 +24,8 @@
   * [common/util~format(template, args)](#module_common/util..format)
   * [common/util~noop()](#module_common/util..noop)
   * [common/util~handleResp(err, resp, body, callback)](#module_common/util..handleResp)
+  * [common/util~is(value, type)](#module_common/util..is)
+  * [common/util~toArray(object)](#module_common/util..toArray)
 
 <a name="module_common/connection"></a>
 #common/connection
@@ -130,6 +132,8 @@ token.isExpired();
   * [common/util~format(template, args)](#module_common/util..format)
   * [common/util~noop()](#module_common/util..noop)
   * [common/util~handleResp(err, resp, body, callback)](#module_common/util..handleResp)
+  * [common/util~is(value, type)](#module_common/util..is)
+  * [common/util~toArray(object)](#module_common/util..toArray)
 
 <a name="module_common/util..extend"></a>
 ##common/util~extend(from, to)
@@ -205,3 +209,40 @@ Uniformly process an API response.
 - callback `function` - The callback function.  
 
 **Scope**: inner function of [common/util](#module_common/util)  
+<a name="module_common/util..is"></a>
+##common/util~is(value, type)
+Check if an object is of the given type.
+
+**Params**
+
+- value `*` - Value to compare to.  
+- type `string` - Type to check against object's value.  
+
+**Scope**: inner function of [common/util](#module_common/util)  
+**Returns**: `boolean`  
+**Example**  
+```js
+is([1, 2, 3], 'array');
+// true
+```
+
+<a name="module_common/util..toArray"></a>
+##common/util~toArray(object)
+Convert an object into an array.
+
+**Params**
+
+- object `object` - Object to convert to an array.  
+
+**Scope**: inner function of [common/util](#module_common/util)  
+**Returns**: `array`  
+**Example**  
+```js
+function aFunction() {
+  return toArray(arguments);
+}
+
+aFunction(1, 2, 3);
+// [1, 2, 3]
+```
+