Question: Composition with seq

Why don't these two work?

(f@seq)(i, i = 1 .. 2);
                        f(i, i = 1 .. 2)

(f@add)(i, i = 1 .. 2);
Error, (in simpl/relopsum) invalid terms in product: 1 .. 2

I was expecting f(1, 2) and f(3).

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