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$REPORTTIME behaves weirdly on macOS

X-seq: zsh-workers 49139
From: Marlon Richert <marlon.richert@xxxxxxxxx>
To: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: $REPORTTIME behaves weirdly on macOS
Date: Wed, 30 Jun 2021 21:50:56 +0300
Archived-at: <https://zsh.org/workers/49139>
List-id: <zsh-workers.zsh.org>

% REPORTTIME=0
% sleep 1
sleep 1  0.00s user 0.00s system 0% cpu 1.008 total
% REPORTTIME=1
% sleep 1
% REPORTTIME=0.99
% sleep 1
sleep 1  0.00s user 0.00s system 0% cpu 1.008 total
% REPORTTIME=1.001
% sleep 1
% sleep 2
% REPORTTIME=1.1
% sleep 2
% REPORTTIME=0.99
% sleep 2
sleep 2  0.00s user 0.00s system 0% cpu 2.006 total
%

What's going on here? It seems that when $REPORTTIME >= 1, no time
output is ever produced.

The exact values here are unique to sleep, but similar behavior can be
observed for other commands, too, albeit at different thresholds.

Follow-Ups:
- Re: $REPORTTIME behaves weirdly on macOS
  - From: Mikael Magnusson

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