Fix indefinite wait and simplify per De Morgan's law

[Hi-Angel]

First commit fixes the bug as described. Second commit simplifies comparison chain by using De Morgan's law.

Note: as described on the referred issue, there's an exception being printed with the commit, however the commit is unrelated to the exception, it's a problem elsewhere (maybe even fixed in other PRs, I've seen there something related to "newer TypeScript support"), because if TS deps are downgraded, exception disappears.

Fixes: https://github.com/TypeStrong/ts-node/issues/2150