[Bug 1771109] [NEW] Domain names containing emoji characters are not supported in console applications

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Ubuntu release:
user at machine:~$ lsb_release -rd
Description:	Ubuntu 18.04 LTS
Release:	18.04

Description:
What I did: Attempted to access a domain name containing an emoji character using curl and other terminal applications
What I expected to happen: Successfully interact with the server represented by said domain name
What happened instead: Got error saying that the domain contains a disallowed character.
Notes: Accessing such a domain using firefox works normally. Interacting with the domain using its punycode form works just fine. Accessing IDNs containing national characters (such as hxxp://ąćęłńóśźż.pl/) works as intended.

Steps to reproduce:
user at machine:~$ curl 📙.la
curl: (3) Failed to convert 📙.la to ACE; string contains a disallowed character

Disclosure: I own such a domain name, but it is not the domain provided
in the example.

** Affects: libidn2-0 (Ubuntu)
     Importance: Undecided
         Status: New

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Domain names containing emoji characters are not supported in console applications
https://bugs.launchpad.net/bugs/1771109
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