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2.1.21 [ECMA-262/5] Section 15.4.4.13, Array.prototype.unshift ([item1 [ , item2 [ , ... ]]])

V0022:

The specification states:

NOTE The unshift function is intentionally generic; it does not require that its this value be an Array object. Therefore it can be transferred to other kinds of objects for use as a method. Whether the unshift function can be applied successfully to a host object is implementation-dependent.

IE9 Mode, IE10 Mode, and IE11 Mode (All Versions)

The unshift method can be applied to a host object; however, some host objects may reject such an application.

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