Question: Summations involving 0^n

Dear All, I seem to be having trouble with 0^n in maple, can someone help? Essentially, I have a complex function that simplifies under certain conditions to
f:=1.*0.^n/factorial(n);
but
sum(f,n=0...0);
gives 0. Whereas,
evalf(subs(n=0,f));
gives 1. Any ideas? Thanks Colin
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