fails:String#each_char passes each char in self to the given block
fails:String#each_char returns self
fails:String#each_char is unicode aware
fails:String#each_char returns characters in the same encoding as self
fails:String#each_char works with multibyte characters
fails:String#each_char works if the String's contents is invalid for its encoding
fails:String#each_char returns a different character if the String is transcoded
fails:String#each_char uses the String's encoding to determine what characters it contains
fails:String#each_char returns an enumerator when no block given
