Suggestion: there should be separate dividers for hierarchies and multi-word options within the same hierarchy

[e-nikolov]

For example

type Multi struct {
	Word Word
}

type Word struct {
	String string
}

type Config struct {
	Multi     *Multi
	MultiWord *Word
}

This sort of config results in both of those options being turned into the flag multi-word-string . This causes some issues when sflags is used in combination with config file parsing libraries because it's impossible to automatically determine if multi-word-string is multi.word.string or multi-word.string.