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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <121220212540.ZM30945@torch.brasslantern.com>
Date: Thu, 20 Dec 2012 21:25:40 -0800
In-reply-to: <20121221025217.GA19294@chaz.gmail.com>
Comments: In reply to Stephane Chazelas <stephane.chazelas@gmail.com>
 "<(<<<x) vs =(<<<x)" (Dec 21,  2:52am)
References: <20121221025217.GA19294@chaz.gmail.com>
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To: zsh-workers@zsh.org
Subject: Re: <(<<<x) vs =(<<<x)
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On Dec 21,  2:52am, Stephane Chazelas wrote:
}
} ~$ od -tc < <(<<<a)
} 0000000   a  \n
} 0000002
} 
} ~$ od -tc < =(<<<a)
} 0000000   a
} 0000001
} 
} Why the difference?

This appears to be a side-effect of =(<<<a) being optimized for no forking
in a manner similar to the optimization for $(<file).  The subshell spawned
to be able to read <(<<<a) as a pipe is appending the newline.

I don't know which variation ought to be considered "correct" ...