vecsum a Vecsmall

vecsum() doesn't "transparently allow a t_VECSMALL" yet, or a List(),
where for example vecsearch() and vecsort() do.
As do vecmin(), vecmax(), but their docs don't mention it explicitly.

Is vecsum() more limited on purpose?

-- Greetings, Ruud

BTW, not even that small. On 64-bit:

? Vecsmall([ -2^63+1, 2^63-1 ])
%1 = Vecsmall([-9223372036854775807, 9223372036854775807])



Potentially confusing:

? setisset(Vec([1,2,42]))
%2 = 1

? setisset(Vecsmall([1,2,42]))
%3 = 0
(shouldn't that error?)