ConfigSource.fromSystemEnv fails when env has variables leading with _ and you are using keyDelimiter "_"

[aappddeevv]

3.0.7 but if there is anything similar in the new one, there could still be an issue.

The fix I found was to use ConfigSource.fromMap(sys.env.filter((k,v) => !k.startsWith("_"), keyDelimiter=Option('_"))

My environment had vars like _ and those starting with _ and that seem to stop env map parsing.

I'm not sure there is any good solution to this other than to check for the key delimiter at the start of an env variable and ignore it or add a flag....everything makes this much more complex for the library so maybe its a documentation issue.