Wow, I'm surprised to see all the votes for calling here. To me, this seems like a textbook "we have a decent made hand and a decent draw, but we don't know what cards we want, so we raise" spot.
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having the nine changes your equity quite a bit against the few hands that have you dominated, and makes me lean towards a push.
This is a good point. It also makes you a small favorite rather than a small underdog against stuff like AA + gutshot.