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Date: Sun, 11 Apr 2021 20:31:54 +0100
From: Stephane Chazelas <stephane@chazelas.org>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: sh emulation POSIX non-conformances ("inf"/"Inf" in arithmetic
 expressions)
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2021-04-11 18:57:26 +0100, Stephane Chazelas:
> Some non-POSIX conformances I can think of ATM:
[...]

Also:

$ zsh --emulate sh -c 'inf=42; echo $((inf))'
Inf

(POSIX requires 42 there).