* Use function string name to check built-in types, * because a simple equality check will fail when running * across different vms / iframes.

获取当前Session :return:

* Check if two values are loosely equal - that is, * if they are plain objects, do they have the same shape?

* Merge two option objects into a new one. * Core utility used in both instantiation and inheritance.

* Ensure a function is called only once.

* Convert an input value to a number for persistence. * If the conversion fails, return original string.

* Recursively traverse an object to evoke all converted * getters, so that every nested property inside the object * is collected as a "deep" de

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