anybody ever heard of a ProxyPassCookie patch

[Jeff Trawick]

and why it was never integrated into Apache 1.3?

It is described here:

http://www.wede.de/sw/mod_proxy/

There is also such a patch in the old bug db and at least one other open 
PR about the need for such a feature (updating domains in cookies during 
reverse proxy operations).

I didn't see any comments in the PRs about technical problems with such 
a feature, but I'm curious if anybody knows of some.