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Date: Sun, 18 Oct 2015 22:46:49 -0700
From: Ray Andrews <rayandrews@eastlink.ca>
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To: Zsh Users <zsh-users@zsh.org>
Subject: suprise with -=
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    test1 ()
    {
    integer first=1
    integer second=2

    ((first+=second))
    echo $first

    ((first-=second))
    echo $first

    first+=second
    echo $first

    first-=second
    echo $first

    }

    3
    1
    3
    test1:15: command not found: first-=second
    3


That's a bit of a surprise, why is zsh fussier with '-=' than with '+='?