Physical storage buffer OpPtrEqual

"Operands to OpPtrEqual, OpPtrNotEqual, and OpPtrDiff must not be pointers into the PhysicalStorageBuffer storage class."

Is this a misprint? How else do I compare these pointers?

Start by reviewing the quoted SPIR-V rule for OpPtrEqual, OpPtrNotEqual, and OpPtrDiff and the surrounding PhysicalStorageBuffer specification text. Determine whether the restriction is intentional or a misprint, then document the clarification or correction so the valid way to compare these pointers is unambiguous.

Written by the indexing model from the issue text.