In fact, it was not intended. I noticed that recently. It is just the result we use the common UNIX variant code. We just didn’t add #ifdef __HAIKU__ for that logic yet.
But I plan to keep things as-is for a while. Because I don’t want to let sites detect our now-buggy browser misbehaves and block it at this stage. As it is too easy to just blocking relatively minor browser on minor platform when they feel harmful and it is harder to revert that blocking rule.