NumberByKey

I would like NumberByKey to return the same interpretation as Str2Num so that
  print NumberByKey("KEY","KEY=0x02;","=",";")
and
  print Str2Num(StringByKey("KEY","KEY=0x02;","=",";"))
return the same value. Currently the NumberByKey doesn't recognise hex, where Str2Num does.
Regards,
Patrick.