Bug?: verify_map may always return `Result.Ok{}`

[cognivore]

Why?

Verify map wraps in Result.new(), but seems to tolerate error case.

How?

• [x] Test if it is indeed the case
• [x] If it is the case, offensively match on {:ok, true}

[cognivore]

Fixed and made regression test. Thanks, @ArsenijSerjogin!