If another function has already emitted the deprecation warning with the
same code as the warning that is about to be emitted, do not emit the
warning.
This is a breaking change. Previously, different functions could emit
the same deprecation warning multiple times. This was a known bug rather
than a feature, but this change is being treated as a breaking change
out of caution. Identical deprecation warnings should not be emitted.
PR-URL: https://github.com/nodejs/node/pull/16393
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
