The question is whether we want to make that docroot change persistent across requests [1] or per-request[2]. Geoff's proposal matches the former [1]behavior, whereas Joe's the latter[2].
I tend to think that per-request[2] is the sane solution. That's because you can never know whether this value was already modified or not when you hit a new process. So you will always try to change it, in which case per-request[2] makes the most sense.
the only cons is that it's different from mp1 behavior, but as the above explains it makes no difference (I believe).
automatic per-request is definitely the way to go if we can do it - people just don't understand the unusual scoping of this field, so helping them along is probably best.
sure, let's do that.
Joe, would you like to merge in the code you've posted before or do you want me to handle that?
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