Handling IPv4, and IPv4-mapped IPv6

[suprstarrd]

This has been moved from a comment.

Seeing 1613f6a, checkIP has been changed to resolve #4:

function checkIP(intake: String) {
     intake = intake.replace('::ffff:', '');

I fear the way this has been changed could be a problem when IPv6 becomes standard.

::ffff: signifies that this is an IPv4-mapped IPv6 address. 0.0.0.0 in IPv4 would look like ::ffff:0.0.0.0 in IPv6.

I think the proper thing to do here would be to adapt all IP's handled that are IPv4 to IPv4-mapped IPv6. The IP's can be treated the same way regardless of source and IP compatibility.

[sudocode1]

Does this even cause an issue? This would only replace ::ffff: not every prefix.

[suprstarrd]

It could potentially cause issues as IPv6 becomes standard. Converting IPv4 to IPv6 will be an encouraging factor for more widespread acceptance of IPv6 (which is very needed, they keep running out of IPv4 addresses)