DataTable: Accept BigDecimal as number

lib/google_visualr/data_table.rb

@@ -243,7 +243,7 @@ def verify_against_column_type(type, value)
         when type == "string"
           raise ArgumentError, "cell value '#{v}' is not a String", caller              unless v.is_a?(String)
         when type == "number"
-          raise ArgumentError, "cell value '#{v}' is not an Integer or a Float", caller unless v.is_a?(Integer)   || v.is_a?(Float)
+          raise ArgumentError, "cell value '#{v}' is not an Integer, Float or BigDecimal", caller unless v.is_a?(Integer) || v.is_a?(Float) || v.is_a?(BigDecimal)
         when type == "boolean"
           raise ArgumentError, "cell value '#{v}' is not a Boolean", caller             unless v.is_a?(TrueClass) || v.is_a?(FalseClass)
         when type == 'datetime'

spec/google_visualr/data_table_spec.rb

@@ -205,6 +205,12 @@ def assert_raises_exception(col, value)
         it "raises an exception if value is not date" do
           assert_raises_exception(4, 'ABCD')
         end
+
+        it "accepts BigDecimal as number" do
+          expect {
+            dt.set_cell(0, 1, BigDecimal.new(42))
+          }.to_not raise_exception(ArgumentError)
+        end
       end
 
       it "accepts 'nil' for all column types" do