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        Thu, 15 Sep 2016 04:22:52 -0700 (PDT)
Date: Thu, 15 Sep 2016 12:22:50 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Oliver Kiddle <okiddle@yahoo.co.uk>, zsh-workers@zsh.org
Subject: wrong "export -p" output for exported but not set variables (Was:
 PATCH: [[ -v varname ]])
Message-ID: <20160915112250.GA16661@chaz.gmail.com>
Mail-Followup-To: Oliver Kiddle <okiddle@yahoo.co.uk>, zsh-workers@zsh.org
References: <20160905212754.24998-1-tgyurci@gmail.com>
 <20160908093516.4fc2dd1e@pwslap01u.europe.root.pri>
 <20160908121628.78977edd@pwslap01u.europe.root.pri>
 <20160908143128.GA14933@chaz.gmail.com>
 <20160909085231.GA9717@chaz.gmail.com>
 <90414.1473890510@hydra.kiddle.eu>
 <20160915110854.GA10122@chaz.gmail.com>
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User-Agent: Mutt/1.5.21 (2010-09-15)

2016-09-15 12:08:54 +0100, Stephane Chazelas:
[...]
> declared (or exported or marked readonly) with different types
> but not assigned to (at least in zsh, declared/exported
> variables are always given a default value)
[...]

Actually, I was wrong about that and was basing it on the output
of typeset -p.

$ zsh -c 'export a; export -p a'
typeset -x a=''

(BTW, it would be nice to have sh-compatible (POSIX at least) output in:
$ ARGV0=sh zsh -c 'export a; export -p a'
typeset -x a=''
)

$ zsh -c 'export a; printenv a'
$ zsh -c 'export a=; printenv a'

$

$a was not given a default empty value there. It's considered as set though:

$ zsh -c 'export a; echo ${a+foo}'
foo

Which I think breaks POSIX compliance (and no other shell
outputs foo there)..

It's different for "readonly":

$ zsh -c 'readonly a; echo ${a+foo}'
foo
$ ARGV0=sh zsh -c 'readonly a; echo ${a+foo}'

$

-- 
Stephane