"3. At the creation time of a sub that references an outer lexical" as opposed to "3. At the creation time of a sub in scope of an outer lexical" is also an optimization that also has little user-visible effect.

ysth posted (in part) to explain the low-level details behind the sub { eval '$i' } problem.
I posted to explain the low-level details behind the my $i if $expr; problem.

I don't see my post as being out of place, although I'll grant you that my opening ("I think that's quite inaccurate.") could have been worded better.

In reply to Re^3: Rules of Lexical Scoping by ikegami
in thread Rules of Lexical Scoping by ysth

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