OSPF/general question: Using v6 next-hop for v4 routes

Hi there, I've been trying to remove v4 transit nets from my setup. This seems to work well for BGP (both eBGP and iBGP) - I have routes for all external v4 addresses with the appropriate next hop set. For my internal routing, I'm using OSPF, but it seems OSPF does not allow v6 next hops for v4 routes. Checking RFC 5838 seems to imply that this is a general design choice for OSPF, but I am not sure if my reading is correct. Also, are there any practical drawbacks for this kind of setup that I may have missed when choosing it for BGP? Thanks, also for any pointers how to achieve the intended setup! Sebastian