# File lib/jmespath/nodes/function.rb, line 392
      def call(args)
        if args.count == 1 && Array === args.first
          args.first.inject(0) do |sum,n|
            if Numeric === n
              sum + n
            else
              return maybe_raise Errors::InvalidTypeError, "function sum() expects values to be numeric"
            end
          end
        else
          return maybe_raise Errors::InvalidArityError, "function sum() expects one argument"
        end
      end