identical, and either both functions are variadic or neither is.
	    Parameter and result names are not required to match.</li>

	<li>Two interface types are identical if they have the same set of methods
	    with the same names and identical function types.
	    <a href="#Exported_identifiers">Non-exported</a> method names from different
	    packages are always different. The order of the methods is irrelevant.</li>