deep.equal() and deep.include() doesn't work with Error #1009

deep.equal() and deep.include() doesn't compare the object keys as I expect it to. I found the issue when upgrading to v4 as the deep.equal() works fine in v3.5. It stopped working in v4+.

Here is a code to confirm the issue: https://jsfiddle.net/wLzrucae/3/.

I tried adding error to the allowed types for include() assertion, but it still failed on comparison. Any ideas?