[Discussion] Expected behavior of combining "all" and "live" options of jmap

[linzang(臧琳)]

 Dear all, 
          we found the jmap’s histo/dump command could accept "live" and "all" options together, and the specification does not describe what is the expected behavior of it.
          I have tried that when these two options used together, the "live" takes effect, no matter what sequences are they in commandline.
          IMO, it is a little confused to use "live" and "all" together, and if it is allowed, the specification may need to be updated to state the behavior clearly.
          Therefore may I ask your suggestion on which option of the following is prefered:
          (option 1.)  disallow using these two options together, I think this is more clear, but I am not sure whether there is backward compatibility risk.
          (option 2.)  allow the combination use of "live" and "all", and update the specification to clearly describe the behavior that "live" takes effect in this case.
          What do you think?

Thanks, 
Lin