comment spam being submitted in UNICODE is missed by 4.7.x - 2.1.4 (not available as a choice in the version dropdown)

It would be helpful (without having to figure out how in the heck PCRE works) to have an option for having anything submitted in UTF-8 automatically flagged as probable spam.

I've got a large amount of Chinese language comment spam appearing in my approval queue and none of it is being caught by the spam module. In looking at the "edit comment" page for the comment (www.example.com/comment/edit/XXX), you can see that it is being submitted in UTF-8.

Since the average user (anonymous or registered) is likely to want to submit their comment in UTF-8, it seems to me that having a way to detect and assign a "probability" to comments submitted this way would be a valuable addition to this modules capabilities.