Not to set PIPESTATUS unless necessary

[Peng Yu]

Hi,

true | true
false
echo ${PIPESTATUS[@]}

In the above commands, echo will print 1. But such information is also
available in $?. Therefore, I think it is unnecessary to set
PIPESTATUS after false. It is better to preserve its value until it is
really necessary. Otherwise, users will have to preserve PIPESTATUS
after running true | true. This will result in more code to write.

Is there already a switch to turn on the behavior that I suggested? If
not, can this feature be added?

-- 
Regards,
Peng