Logging config documentation is too restrictive wrt ext:// references in custom objects

Problem description The docs warn that for the following formatter config… formatters: custom: (): my.package.customFormatterFactory bar: baz spam: 99.9 answer: 42 … following restrictions apply: The values for keys such as bar, spam and answer in the above example should not be configuration dictionaries or references such as cfg://foo or ext://bar, because they will not be processed by the configuration machinery, but passed to the callable as-is. However i...