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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <130411101134.ZM9127@torch.brasslantern.com>
Date: Thu, 11 Apr 2013 10:11:34 -0700
In-reply-to: <20130412.014056.161822707.ghostrevery@gmail.com>
Comments: In reply to Yuya Amemiya <ghostrevery@gmail.com>        "printf bug"
 (Apr 12,  1:40am)
References: <20130412.014056.161822707.ghostrevery@gmail.com>
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To: zsh-workers@zsh.org
Subject: Re: printf bug
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On Apr 12,  1:40am, Yuya Amemiya wrote:
}
} I think printf built-in command has a bug.
} 
} % printf "%u\n" 0xffffffffffffffff
} zsh: number truncated after 15 digits: ffffffffffffffff
} 1152921504606846975

Zsh doesn't have an internal string-to-unsigned operation, so unsigned
is limited to the range of positive signed.

You'll note that you also can't declare zsh integer-typed variables to
be unsigned.