Says extremely:

i think the point of that last bit was that "foreach" and "for" act differently.

Definitely wrong. for and foreach are completely identical. Once Perl finishes compiling your program, it can't even remember which one you used.

If you look in toke.c, you will see:

        case KEY_for:
        case KEY_foreach:
        ... code here that handles 'for' and 'foreach'
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This is in the vicinity of line 4145.