Not sure what to do when a user tries to insert an ShMemNode that was created at some time prior to s_now into another ShMemNode. In this case, if the node to be inserted was a leaf it will have a timestamp less than s_now, so our invariant will be broken.
This behavior just shouldn't be allowed, but I don't want to use an exception because I'll have to change method signatures everywhere.
Not sure what to do when a user tries to insert an ShMemNode that was created at some time prior to s_now into another ShMemNode. In this case, if the node to be inserted was a leaf it will have a timestamp less than s_now, so our invariant will be broken.
This behavior just shouldn't be allowed, but I don't want to use an exception because I'll have to change method signatures everywhere.