decamelize-keys-deep2 (npm): Deeply convert the camelized keys of an object into a lowercased one with a custom separator: unicornRainbow → unicorn_rainbow
Keywords: map|obj|object|key|keys|value|values|val|decamelize|decamelcase|camelcase|case|dash|hyphen|dot|underscore|separator|string|text|convert|deep|recursive