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Why such math-expression error?

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From: Sebastian Gniazdowski <sgniazdowski@xxxxxxxxx>
To: Zsh Users <zsh-users@xxxxxxx>
Subject: Why such math-expression error?
Date: Mon, 6 Jul 2020 08:56:10 +0200
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Hi
I've got in a script a code:

(( ${+ice[make]} )) && ...

It causes the following error:

∞zinit-make-hook:9: bad math expression: operand expected at end of string

When I do local -A ice, the error disappears. Printing ${(t)ice} shows
empty string, and unset ice doesn't help.

Why such error? In interactive shell, I can $+ basically any expression I
want in an $((, specifically (( ${+unset_var[string]} )) works fine.

-- 
Sebastian Gniazdowski
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zinit
Blog: http://zdharma.org

Follow-Ups:
- Re: Why such math-expression error?
  - From: Sebastian Gniazdowski

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