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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <120628150035.ZM28226@torch.brasslantern.com>
Date: Thu, 28 Jun 2012 15:00:35 -0700
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Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
 "Re: typeset -F3 SECONDS doesn't work the first time" (Jun 28,  8:11pm)
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To: zsh workers <zsh-workers@zsh.org>
Subject: Re: typeset -F3 SECONDS doesn't work the first time
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On Jun 28,  8:11pm, Mikael Magnusson wrote:
}
} Right, the fractional part was what I wanted to show. sleep in both
} pipelines can sleep for subsecond intervals, but afaik there's no
} builtin sleep command in zsh.

Hrm, dunno what I was thinking there except that I couldn't figure
out why you used =sleep in one example but not the other.

In any case init.c:setupvals() loads the shtimer global directly to
initialize SECONDS and then a bit later calls createparamtable() to
copy the environment, which goes through params.c:intsecondssetfn()
which resets shtimer.tv_sec and zeroes shtimer.tv_usec.

So this probably has to do with rounding error when converting shtimer
to double by typecast and division in params.c:floatsecondsgetfn().

Same thing happens without the code snippet from workers/30540 so that's
not involved.