In code-golf questions, we typically score submissions by their byte count. However, whenever a submission uses a character outside of the ASCII range, the question of which encoding the code uses comes up.
One language for which this is quite relevant is APL, due to its use of many characters outside of ASCII and which have multiple-byte UTF-8 encodings. It is also relevant in many other languages.
As far as I can tell, we don't have a policy on how to handle this currently.
Here are some possible ways to handle it:
Everything is UTF-8.
Languages may have specific encodings. If there is no standard encoding for a given language, use UTF-8.
Submissions may have specific encodings. If none is given, a language-wide default applies. If the language has no default, UTF-8.
I'm sure there are other possibilities, and I would be interested in hearing proposals. I do believe this is an issue we need a firm policy on, because this question seems to come up every single time someone writes an answer in APL, and reasonably often on other answers as well.