[tosti]

I don't think you should take responsibility for bugs. Debugging is the act of removing bugs, so programming is the act of putting them in. Free software, per license, must not come with guarantees because the legal implications of any warranty whatsoever could cripple free software projects. The license of your nice DNS server includes the "as-is" wording for good reason.

That said, it is comendable that you've gone out of your way to hold up your software against very high standards. That kind of quality speaks for itself :)