checkincludedtext behavior

[definitely what]

Russ Allbery writes:
  Jeffrey M Vinocur <jeff at litech.org> writes:
  > Or do we want to declare that anybody who wants to fiddle with this
  > should just disable it and use a posting filter?
  I'm leaning a bit towards the latter, but I don't have a very strong
  opinion.  I've always considered the included text check to be pretty
  worthless, so I'm probably the wrong person to be deciding; I'd be
  interested to hear from someone who actually uses it.
  
I've always liked it, but if you could get it to prevent people from
top-posting, that would be super-cool.

rone
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