Was something missed for 12.6 about "?:"?

[gs]

The wording of advisory #12.6 indicates expressions other than effectively boolean ones are permitted as the conditional argument to "?:". Was this wording an oversight? In three other circumstances, the guidelines insist on effectively boolean expressions and it seems unintuitive to not require such in this case as well.

[misra-c]

It is intended that the first operand of the ternary operator should be effectively Boolean. This will be made clear in a future revision of the MISRA C Guidelines.