It's always worth considering whether you have people who will give you genuine glowing references.

I've only ever once been at a place where there was a policy saying "all you are allowed to say during reference checks is "yes, they worked here as [job title], from {month/year} to {month/year}". And even with that policy/restriction I still found ways to be much much more positive about the people who were genuinely great.

One great way around that kind of policy - at least if you far enough into your career for it - is to provided references for people who are also no longer at the company they're being a referee for. There are 3 or 4 people from that job I mentioned that didn't allow me to elaborate, where I've subsequently provided reference including something like "Ratica? Yeah - she is great! She lead my QA team and worked magic! You might want to warn the company she's applying to that as soon as I get a role and budget that suits her QA skills, I'll 100% be trying to headhunt her away from them."