Both GitHub and Cursor’s response seems a bit lazy. Technically they may be correct in their assertion that it’s the user’s responsibility. But practically isn’t part of their product offering a safe coding environment? Invisible Unicode instruction doesn’t seem like a reasonable feature to support, it seems like a security vulnerability that should be addressed.
It's not really a vulnerability, though. It's an attack vector.
It's funny because those companies both provide web browsers loaded to the gills with tools to fight malicious sites. Users can't or won't protect themselves. Unless they're an LLM user, apparently.