The use cases for detecting reflection probes in llCastRay are very limited. I would argue that a raycast detecting a reflection probe is more than likely unwanted interference the vast majority of the time.
Existing creations that use llCastRay were built before reflection probes were a thing are likely to break in subtle ways as users begin to place reflection probes everywhere.
I propose adding a new flag, RC_DETECT_PROBES, which defaults to FALSE, only if the creator manually sets this to TRUE shall raycasts pick up probe volumes.