Question about font-lock-compile-keywords

[Drew Adams]

font-lock-compile-keywords added an optional arg for Emacs 22. It looks,
from a quick glance, as if a non-nil value for that arg gives behavior
similar to what the function did in Emacs 21 and 20.

Wouldn't it be better for the optional arg to be complemented, so that a
value of nil gave (more or less) the pre-22 behavior? Wouldn't that make
things easier for third-party libraries that call font-lock-compile-keywords
(with no second arg)?

Just a question. And again, I took only a quick look at the code, so perhaps
I'm mistaken about the behavior.