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that's specific to your os it renders in os emoji colors iirc.

I’ve always seen emoji being stripped on HN, so it’s very surprising to see colors for once

They've always been stripped for me as well. This "emoji" actually appears black for me however.

I think the reason its not stripped is because it's actually "U+2665 : BLACK HEART SUIT {valentine}" which predates the emojis. Lots of fonts and OSes will render these older unicode symbols as emojis

Well, in theory, with proper UTF-8 support you don't need to filter out anything.

Unsupported unicode code points are just rendered using a place holder.

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