Closing unclosed tags is invalid and problematic

[Andarist]

What is explicitly handled by snarkdown -https://github.com/developit/snarkdown/blob/b01a5cddabd9fba97175c896e14c881e586a4631/test/index.js#L155 is incorrect and might cause trouble for consumers

https://babelmark.github.io/?text=*foo