On 2021-12-19 4:07 a.m., Oodler 577 via perl5-porters wrote: > The closest concept I can think that I might be familiar with is Fortran's > NaN, which is part of the IEEE arithmetic standards. It is composed of a > special values that can be detected in hardware or software. This again, the NaN concept of Fortran or IEEE floating point numbers, is another reason I actually advocate for a concept like I expressed with Excuse, where an explicit reason for a missing regular value is encoded in the not-regular-value result. An Excuse duals for the concepts of unthrown exception as well as the concept of a NaN, of which there are several kinds, such as divide by zero, underflow, etc. -- Darren DuncanThread Previous | Thread Next