Re^6: Reassigning $_ in loop doesn't stick

in reply to Re^5: Reassigning $_ in loop doesn't stick
in thread Reassigning $_ in loop doesn't stick

Efficiency (speed and memory).
You can pass it to for, a function, etc to be modified.
Use the return as an lvalue. Well, you can take a reference to it at least.
Simplicity. It takes extra work to make the copy.

Mainly, I figure it just happened to work that way. And since there's no reason to change it, they decided to document it.

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