I just sent upstream a patch implementing realpapth() semantics:
Date: Tue, 16 Aug 2016 23:54:38 +0000
From: Daniel Shahaf <d...@daniel.shahaf.name>
To: zsh-work...@zsh.org
Subject: [PATCH] New :P history modifier.
Message-Id: <1471391679-9604-1-git-send-email-danielsh@tarsus.local2>
X-Seq: 39046
