In general, you should not solicit from counterparties whether they believe the terms they are offering to you are reasonable or not. Assuming you're a well-compensated professional, which is true of the overwhelming majority of people on HN signing CIIAAs, you can afford to have every one read by a lawyer working for you, and you probably should.

In terms of whether it's a market term or not: continuing to own your work _even after you're separated_ is a market term; _owning work created after you're separated_ is not. There is virtually nothing that could possibly induce me to sign that second clause, for anyone. If you can't distinguish between these two, that's a great argument for having a specialized interpreter of contracts doing this instead of you.