Spurious SC2086 warning on $PIPESTATUS

[viavi-ab]

For bugs

• Rule Id (if any, e.g. SC1000): SC2086
• My shellcheck version (shellcheck --version or 'online'): online
• I tried on shellcheck.net and verified that this is still a problem on the latest commit
• It's not reproducible on shellcheck.net, but I think that's because it's an OS, configuration or encoding issue

For new checks and feature suggestions

• shellcheck.net (i.e. the latest commit) currently gives no useful warnings about this
• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows the problem:

#! /bin/bash
# shellcheck disable=SC2181 # (style): Check exit code directly with e.g. 'if mycmd;', not indirectly with $?.

[ $? -eq 0 ]
[ ${PIPESTATUS[0]} -eq 0 ]

Here's what shellcheck currently says:

Line 5	SC2086: Double quote to prevent globbing and word splitting.

Here's what I wanted or expected to see:

Nothing. Elements of the $PIPESTATUS array are numeric by definition. Just like $?, it doesn't need to doublequoted (at least not to prevent globbing and word splitting; you may want to quote it in case the particular element you're accessing is empty)