Well, "must" is not the right word here, IMHO "should" is :-)
As you want to, let's say "should" ;)
So why not just choose something which fits - say - 50% or more of all users *by default* over something 100% of all users have to set manually? I mean, I think I got the issue, but IMHO it's worth thinking about it again.
Don't forget one thing: we are the ones that receive most of the "help, I've got a problem" messages about phpMyAdmin. And it's quite easy to reply "he, he, you forgot to put the 'http' scheme in this setting", "this setting is case sensistive" or "why don't you use the dynamic way suggested in the documentation ;)" but it's really hard to guess which server variable is not defined the way it should and causes phpMyAdmin to fail.
Just think most of "rookies" won't change this variable if it contains "cryptic" variables they don't know anything about. And, of course, they won't be able to tell us before 10 messages what are environment variables their server define.
Loïc
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