Issue: FUNCTION-TYPE (Version 5)

[David A. Moon <Moon@STONY-BROOK.SCRC.Symbolics.COM>]

Since apparently we're going to discuss this proposal at length on the
X3J13 mailing list, I just wanted to point out one minor hole in it.

    CONVERSION COST:
    One strategy for
    automatic conversion is to replace every call to FUNCALL, APPLY, etc.
    with a call to an equivalent function or macro that tests the functional
    argument at runtime and coerces the argument to a true function if
    necessary.  If implemented carefully, this should not cost significantly
    more than doing a built-in coercion within FUNCALL and APPLY.

There is a large number of functions hiding inside that little "etc."
By my count there are 61 functions in Common Lisp that take :test or :key
arguments.  There are probably a few other functions that call FUNCALL
or APPLY internally.