I think it's time to actualy fix this thing. I propose a new $^H (or %^H) hint that selects if ARGV magic open uses two-arg or three-arg open. What would matter is the value in effect at the moment of the open. I propose a pragmata to select it, and an additional "lock" feature, which would not allow changing the value after that point (in execution order, allowing it to be a feature of the module code, not the core).

IOW: use magic::ARGV qw(safe lock); allows you to trust all code from that point on. (use magic::ARGV qw(safe); wouldn't lock it in, so it could be explicitly overruled, use magic::ARGV qw(more-magic); would give back the old behaviour. All that's left is to get better names, perhaps change the default from more-magic to safe, and actualy code the thing.

Agree, disagree? Think I should be saying this on p5p already?