Hi,

In message "Re: [ruby-core:36939] Re: Object#trust vs Object#taint"
    on Fri, 10 Jun 2011 23:09:37 +0900, James Gray <james / graysoftinc.com> writes:

|> If $SAFE is removed or widely changed, it will break backward
|> compatibility, so it may be better to be done in 2.0.
|
|Do we have any idea if $SAFE is actually used?

$SAFE level 1: yes, a lot.  $SAFE level 4: no, as far as I know.
Those two levels are different beasts.

							matz.