Implement PartialEq for Cursor

[Luro02]

I am thinking about something like this

impl<T: PartialEq> PartialEq for Cursor<T> {
    fn eq(&self, other: &Self) -> bool { self.get_ref() == other.get_ref() && self.position() == other.position() }
}

is there a reason why this is not implemented?

[jonas-schievink]

This implementation would mean that two Cursors pointing at different positions of the same data would compare equal (can be fixed by also comparing position, of course).

[Luro02]

I updated the implementation