Actually, "called" and "callable" are OK, if the documentation says
somewhere that the normal effect of "calling" a type object is to invoke
__new__. The places I looked first (sections 3.1, 3.3, and 3.4.1) do not
say this. 5.3.4 does say that the result of calling a class object is a
new instance of that class, but it doesn't mention __new__. So perhaps
it would OK to just add something like the following to 3.4.3:

Note that if a metaclass is a subclass of <code>type</code>, it should
override <code>__new__</code>, not <code>__call__</code>.