Allow chainable actor-like objects to be basic

lib/service_actor/playable.rb

@@ -90,7 +90,15 @@ def callable_actor?(options)
     end
 
     def play_actor(actor)
-      if actor.is_a?(Symbol)
+      actor_includes_kernel = begin
+        actor.respond_to?(:is_a?)
+      rescue NoMethodError
+        false
+      end
+
+      if !actor_includes_kernel
+        actor.call(result)
+      elsif actor.is_a?(Symbol)
         send(actor)
       elsif actor.is_a?(Class) && actor.ancestors.include?(ServiceActor::Core)
         play_service_actor(actor)

spec/actor_spec.rb

@@ -1491,4 +1491,37 @@ def match_result(result)
       expect(result.error).to start_with('The "value" input on')
     end
   end
+
+  context "when actor inherits from `BasicObject`" do
+    t = Class.new(BasicObject) do
+      class << self
+        def [](attribute, value)
+          new(attribute, value)
+        end
+      end
+
+      def initialize(attribute, value)
+        @attribute, @value = attribute, value
+      end
+
+      def call(actor)
+        actor.__send__(:"#{@attribute}=", @value)
+      end
+    end
+
+    let(:actor) do
+      Class.new(Actor) do
+        output :value, type: Integer
+
+        play t[:value, 42]
+      end
+    end
+
+    it "does not raise" do
+      result = actor.result
+
+      expect(result).to be_a_success
+      expect(result.value).to eq(42)
+    end
+  end
 end