fails:String#unpack with format 'P' ignores whitespace in the format string
fails:String#unpack with format 'P' calls #to_str to coerce the directives string
fails:String#unpack with format 'P' raises a TypeError when passed nil
fails:String#unpack with format 'P' raises a TypeError when passed an Integer
fails:String#unpack with format 'P' returns a random object after consuming a size-of a machine word bytes
fails:String#unpack with format 'p' ignores whitespace in the format string
fails:String#unpack with format 'p' calls #to_str to coerce the directives string
fails:String#unpack with format 'p' raises a TypeError when passed nil
fails:String#unpack with format 'p' raises a TypeError when passed an Integer
fails:String#unpack with format 'p' returns a random object after consuming a size-of a machine word bytes
