Manually entered path can override another Drupal internal path

Issue Summary

A manually entered path in the path field, can override / hide another node, if you enter the other node's node/# in as the path.

For example, say you create node/7088 as a test page... then you create node/7089 as a 2nd test page, only this time you enter node/7088 in the path. You will no longer be able to pull up the original page, unless you change the path in the 2nd page to something else. I can't think of any use case for this... At the very least, it should give a warning that the path already exists for another node...

Not sure if it works this way in Drupal 7 or not, I will test it out and report back.