<Someone> reported that after an uncontrolled teleport due to eating a
leprechaun, his leashed pet was still leashed until he took one more step.
The usual approach which included disallowing the teleport seemed wrong in
this case, so I put in an abbreviated version that does its checks but does
not disallow the teleport. The pet teleports with you in the same cases as
other teleports, but when it doesn't, the leash snaps loose.
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