Re: un-deprecating CL

[Richard Stallman]

    > As for mapcar, it is pretty slow already, and the main cost is in
    > calling the user's function.  That won't get any slower.

    Then again: how many uses of mapcar* have you encountered?
    If you object to `union' because it's not used often, I'd expect you to
    reject the vararg version of mapcar.

The issues are not similar.  One is adding a new function.
The other is a simple, natural extension in an existing function.
The former costs more, in complexity.