Punycode is an encoding for arbitrary Unicode into 7-bit clean ASCII.
It was specified by the IETF in RFC 3492 for use with IDNs and IDNA. This module provides encoding and decoding procedures for punycode, not IDNA.
Only a few extra steps would need to be taken to support IDNA (namely, to fail out if a string contains only ASCII characters and to handle xn-- preficies); however, this module is meant to be more general-purpose.
Only two functions will be exposed on import: encode and decode, both take only one argument of type string and return one value also of type string.
This module targets lua 5.x and luajit.