5
This has been done. I applied the lang-hs code language for the default syntax highlighting for the tag.
4
I did this thing. Not sure if it's retroactive, but it should be set going forward.
3
The language highlighting rules are determined by the tags applied to the question. In this case, the question doesn't have any language tags, so it looks like you need to be explicit. You'd also have to be explicit in the event that your code was in a language that was not part of the question's tags.
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