objspace: Hide identhash containing internal objs

Inside ObjectSpace.reachable_objects_from we keep an internal identhash
in order to de-duplicate reachable objects when wrapping them as
InternalObject. Previously this hash was not hidden, making it possible
to leak references to those internal objects to Ruby if using
ObjectSpace.each_object.

This commit solves this by hiding the hash. To simplify collection of
values, we instead now just use the hash as a set of visited objects,
and collect an Array (not hidden) of values to be returned.

0 files changed, 0 insertions, 0 deletions