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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <110812200942.ZM8287@torch.brasslantern.com>
Date: Fri, 12 Aug 2011 20:09:42 -0700
In-reply-to:
 <CAELbujo=KyJyzzo1vW+ydLVA=PddguguXkBr7yN3zvmOgmYFpQ@mail.gmail.com>
Comments: In reply to Micah Elliott <micah@membean.com>
 "Idiom for booleans" (Aug 12,  5:24pm)
References: <CAELbujo=KyJyzzo1vW+ydLVA=PddguguXkBr7yN3zvmOgmYFpQ@mail.gmail.com>
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To: zsh-users@zsh.org
Subject: Re: Idiom for booleans
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On Aug 12,  5:24pm, Micah Elliott wrote:
}
}   % (( 0 ))
}   ((: command not found
}   % (( 1 ))  # ok

This has to be something in your configuration.  Try it with zsh -f ?

torch% (( 0 ))
torch% ((
math> ))
torch% (( 0 )) || echo nope
nope
torch% 

This one I'm not sure is intentional:

torch% (( )) || echo oops
oops
torch% 

} I'm trying to figure out if the $+ expansion, as in ${+param}, is
} worth making use of. What idiom do you use for it? I could see it as a
} boolean for testing flags.

Yes, that's a common usage.