A guaranteed valid Elm module name.

Convert a Name to a String that works in elm.json

Try to convert a String into a Name:

fromString "Maybe"       == Just ...
fromString "Elm.Name"  == Just ...
fromString "Json.Decode" == Just ...
fromString "json.decode" == Nothing
fromString "Json_Decode" == Nothing

Turn a Name into a string for use in elm.json

Decode the module name strings that appear in elm.json