given? does not recognize multi-part date inputs

[solebared]

I was pleasantly surprised to find that AI already supports multi-part params such as those generated by the date_select helper.

However it appears that given? does not correctly recognize such inputs.

Easiest way to demonstrate the issue was with this failing test.

diff --git a/spec/active_interaction/base_spec.rb b/spec/active_interaction/base_spec.rb
index ff35e8f..8bfdd8b 100644
--- a/spec/active_interaction/base_spec.rb
+++ b/spec/active_interaction/base_spec.rb
@@ -589,6 +589,32 @@ describe ActiveInteraction::Base do
         expect(result).to be false
       end
     end
+
+    context 'multi-part date values' do
+      let(:described_class) do
+        Class.new(TestInteraction) do
+          date :thing,
+            default: nil
+
+          def execute
+            given?(:thing)
+          end
+        end
+      end
+
+      it 'is true when the input is given' do
+        inputs.merge!(
+          'thing(1i)' => '2020',
+          'thing(2i)' => '12',
+          'thing(3i)' => '31'
+        )
+        expect(result).to be true
+      end
+    end
   end
 
   context 'inheritance' do

Happy to work up a PR if you like, though i may have some questions around how to deal with partial inputs (eg, if just the year param is missing).

Much appreciation for this gem!