I was going compain about null bytes in text (never, period), but then realized you actually did mean the U+2400 SYMBOL FOR NULL[0] character itself. That's surprisingly viable (though you do now have to worry about the string "\xE2\x90\x80" ending up in your data).
0: Which is actually incorrectly named - it should be "SYMBOL FOR NUL".
0: Which is actually incorrectly named - it should be "SYMBOL FOR NUL".