Return the version of the last object read or written to.
This exposes the internal version number of the last object read or written via this io context
@param io the io context to check @returns last read or written object version
See Implementation
Return the version of the last object read or written to.
This exposes the internal version number of the last object read or written via this io context
@param io the io context to check @returns last read or written object version