Rye::Set#disable_safe_mode seems broken

[rickhull]

https://gist.github.com/anonymous/d32fd6028bb3774c9060

Basically, with Rye::Set#disable_safe_mode, whitelist exceptions are still raised.

it's only with Rye::Set.new(foo, safe: false) that exceptions are properly swallowed.

Is #disable_safe_mode working as expected?