Task

Take a   Natural Number   in a given base and return the sum of its digits:

   110         sums to   1
   123410   sums to   10
   fe16       sums to   29
   f0e16     sums to   29


say Σ $_ for <1 1234 1020304 fe f0e DEADBEEF>;
 
sub Σ { [+] $^n.comb.map: { :36($_) } }