On the format of the output of fMax

[Alberto Candel]

In CAS, the input fMax(f(x),x=a..b) returns a sequence consisting of the numbers x between a and b where the function f attains a Max value. For example, fMax(x^2, x=-2..2) returns -2,2. However, if there is just one such value x, it returns seq[x], like fMax(x+1,x=-2..2) returning seq[2].
Why not just 2, or even better, {2} (or {-2,2} above)?

Some of my Adv Calc students have a Prime (because I suggested it to them) and at first could not understand the "seq[x]" thing.

(As Helge points out below, there was a typo. I have replaced fMax(x+1,x=-2,2) with fMax(x+1,x=-2..2).)