Currently R7RS says nothing about the value of (max +inf.0 +nan.0) or (min -inf.0 +nan.0). R6RS required these functions to return the infinite value, but this was adopted by some but not all R6RS implementations (see MaxInfNan for details). R5RS implementations are also divided.
The proposal is to allow R7RS implementations to provide either value.
WG1 voted to continue to say nothing.