Based on the number of posts I’ve seen about arena allocators on here the last month or so, I’d say the audience is much higher than nonzero.
Begone pedant, and feast thine eyes on the surreal numbers [0]!
> In mathematics, the surreal number system is a totally ordered proper class containing not only the real numbers but also infinite and infinitesimal numbers, respectively larger or smaller in absolute value than any positive real number.
(Also, go look at the `fil` unit in TeX for a good practical application of this ;).)