That sounds unlikely, ligatures are two or more consecutive graphemes graphemes joined into a single glyph, but only visually. The underlying text is unmodified, so as far as the renderer is concerned, the text is still "arsenal".

Recursively how?

Pretty sure the answer is "no" but I'll explain more what I was wondering.

Assume "arse" and "anal" are both on the bad and that underscores are treated like irrelevant whitespace.

Arsenal

A___nal

A______

You mean "arse" and "enal"? So basically overlaps? That's a good question, I'm not sure what happens there, I think the first ligature "wins".

Yeah, if you type "cuntits" it only censors "unt".

No. I mean first the "arse" rule is applied, and then the "anal" rule (because this didn't exist previously and because the blanked out letters are ignored) is applied next

Oh, I see. No, that's not how ligatures work. I also don't see why A___nal would be censored, it's clearly not intended to be a curseword.

Just running with the idea expressed an a parent comment above. I think neither "anal" nor "arse" should be censored