If any part of LIST is an array, "foreach" will get very 
confused if you add or remove elements within the loop 
body, for example with "splice".   So don’t do that.

Isn't this just saying if one is manipulating an element that is itself an array, not the LIST itself? I would think as long as one stuck to scalars, it should be OK, although one would have to be careful.

Update: This one works... iffy (same ballpark), but works:

@foo = qw/a b c d e f g/;

map{ push @foo, 'h' if /^d$/ } @foo;

print @foo, "\n";
[download]

I think it's a case of simply having enough rope to hang yourself.