[DO NOT MERGE] 1. Move the current head command to the new command mds_head; 2. Change the semantics of the head command #87
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Background
This PR deals with the issue #84
Summary
In this PR, we do the followings
head
command as the new commandmds_head
.head
command to ensure that we can really retrieve the content of a designated object when the newhead
command returnstrue
for the object.