According to https://www.erlang.org/doc/man/logger#get_primary_config-0 and https://www.erlang.org/doc/man/logger#type-primary_config,
returned type for `:logger.get_primary_config` is:
```erlang
#{level => level() | all | none,
metadata => metadata(),
filter_default => log | stop,
filters => [{filter_id(), filter()}]}
```
Thus, inside `Logger.level/0` fun, `level` could also be `all` and `none` when calling:
```elixir
%{level: level} = :logger.get_primary_config()
```
David JULIEN
c5816a227f