fails:String#unpack returns an array by decoding self according to the format string
fails:String#unpack with 'N' and 'n' directives returns an array by decoding self according to the format string
fails:String#unpack with 'a', 'X' and 'x' directives returns an array by decoding self according to the format string
fails:String#unpack with 'DdEeFfGg' directives returns an array by decoding self according to the format string
fails:String#unpack with 'DdEeFfGg' directives returns an array by decoding self in little-endian order according to the format string
fails:String#unpack with 'U' directive returns an array by decoding self according to the format string
fails:String#unpack with 'M' directive returns an array by decoding self according to the format string
fails:String#unpack with 'm' directive returns an array by decoding self according to the format string
fails:String#unpack with 'w' directive produces a BER-compressed integer
