> It would be nice if Perl's loop-keywords would also recognise an Iterator::* object and would treat it as expected... (internally rewriting it C-style, whatever).

I doubt this can be retro fitted without bracking backwards comaptibility.

You'd need a new keyword, like iter for my goal, this could actually be implemented with pluggable keywords.

Please note that you can already overload the diamond operator of a class to make the object an iterator (like a filehandle does)

This should work:

while ( my $next = <$obj> ) {
    ...
}
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but letting a generator init an iterator once wouldn't

while ( my $next = <generator($limit)> ) {
    ...
}
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because the diamond operator magically decides to become a file-glob here.