Unsure about this one, but I find the preceding commit to be very
lacking in explaining to the user why the editor don't work. Shining
some things red may help aid understanding.
`EqualityComparer<object>.Default()` will be slow, will fall back to
`object.Equals()` which may do the right thing, the wrong thing, or be
useless due to using reference equality semantics.
In practice in this call site it likely doesn't matter anyway but I'd
rather be future-proof than not.