Add nullptr_t overload to resolve ambiguity.
Add nullptr_t overload to resolve ambiguity.

vast-io/vast,mavam/vast,pmos69/vast,mavam/vast,mavam/vast,pmos69/vast,vast-io/vast,pmos69/vast,vast-io/vast,mavam/vast,vast-io/vast,pmos69/vast,vast-io/vast