[erlang-questions] Deprecation warnings: OTP20 and OTP21 compatible code

[José Valim]

> I'd be open to having a mechanism to force-remove it, but I'd be annoyed
> to lose the ability to go add it back though.
>

Maybe have a mechanism that explicitly opts-in to keeping the warnings as
errors from dependencies? Something like {warnings_as_errors_from_deps,
keep | force | ignore}, but defaults to ignore?
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