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Date: Tue, 9 Oct 2018 09:27:26 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: TS <debts@xk2c.de>
Cc: Zsh workers <zsh-workers@zsh.org>
Subject: Re: zsh-workers 43616, typeset doesn't report tied parameters
Message-ID: <20181009082726.nm6yeuqfjghtounf@chaz.gmail.com>
Mail-Followup-To: TS <debts@xk2c.de>, Zsh workers <zsh-workers@zsh.org>
References: <f181228f-ebf8-26bd-7c3a-578d29d4689a@xk2c.de>
 <20181009073138.c6uxzj6uljevwqcx@chaz.gmail.com>
 <816f3f14-f4d9-13f5-5e46-61da75e2eb6a@xk2c.de>
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User-Agent: NeoMutt/20171215

2018-10-09 10:00:14 +0200, TS:
[...]
> % prv() { print -l "${(t)${(P)1}} ${1}=${(P)1}" ; }
> % IMPORTANTVAR=foo
> % prv IMPORTANTVAR
> scalar IMPORTANTVAR=foo
> % readonly IMPORTANTVAR
[...]
> % importantvar=(buuz)
> % prv IMPORTANTVAR
> scalar-readonly-tag_local IMPORTANTVAR=buuz
> 
> basically currently the readonly flag is bypasable this way for every var
> and therefore mood. Somehow i can't believe this is by design, instead of an
> overlook.
[...]

But no need for that to change the value of a readonly variable.
readonly is not a security feature (except maybe for specials,
but even then that's pointless unless you use the restricted
mode (and even then, I'd argue the shell is not the right place
to restrict the user, it's better to use OS containing
features)).

$ readonly VAR=foo
$ typeset +r VAR
$ VAR=bar
$ echo $VAR
bar

-- 
Stephane