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Date: Sun, 3 Jan 2016 19:00:31 +0000
From: Peter Stephenson <p.w.stephenson@ntlworld.com>
To: zsh-workers@zsh.org
Subject: Re: [BUG] functions can't create global readonly variables
Message-ID: <20160103190031.24249cf5@ntlworld.com>
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By the way it seems that, in bash at least, "readonly" breaks
encapsulation:

$ readonly foo=empty
$ fn() { local foo=bar; echo $foo; }
$ fn
bash: local: foo: readonly variable
empty

The only use I can see of this is for exported variables, where you
might want to ensure a specific value was always exported to an external
programme.

pws