If this has the LOCKABLE flag set, check if the current EXCLUSIVE lock on
object is the only
one, this means that changes to the object will not be visible to any other object.
If the LOCKABLE flag is not set, check if the refcount of this is exactly 1, meaning that no other reference exists to the object and that the object is therefore writable.
Modification of a mini-object should only be done after verifying that it is writable.
the mini-object to check