Comment by jiggawatts

Are you arguing to just allow any byte in names (which are ultimately user-defined input data), including 0x00, Unicode byte order markers etc., in a thread about a perceived correlation between developers' lack of i18n awareness and security bugs no less?

The reality is that there is often a tradeoff between keeping your test and edge cases simple via constraining allowable inputs and internationalization.

So I think you've got it exactly the wrong way around: These limitations might have happened precisely because somebody wanted to do the right thing from a safety/security perspective by doing overly strict input validation, at the expense of internationalization/compatibility.

Not saying that that's a good tradeoff in every case, but I really don't think you can draw any conclusions about a system's security by looking at whether it arbitrarily disallows some inputs (or if anything, maybe the opposite).