"least surprise" is a powerful consideration.

In Perl 6, you can declare the iteration variable of the for to have the desired attributes. For a given you could use an expression to cause a copy to be made: given (0+$x) {... and if you write a function that just returns its argument, and you call that function copy, then you could write given (copy $x) ... nice and sugary. It would be harder to impose aliasing if the normal case didn't.

But since it's been this way for a while now, I think any "fix" will be to use a pragma to choose the behavior.

In reply to Re^4: "when" and replacements by John M. Dlugosz
in thread "when" and replacements by John M. Dlugosz

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