Allow Hash as a possible config value

Author: ojab

lib/dry/configurable/config.rb

@@ -57,8 +57,7 @@ def []=(name, value)
       # @api public
       def update(values)
         values.each do |key, value|
-          case value
-          when Hash
+          if value.is_a?(Hash) && self[key].is_a?(self.class)
             self[key].update(value)
           else
             self[key] = value

spec/integration/dry/configurable/config_spec.rb

@@ -35,6 +35,18 @@
       expect(klass.config.db.user).to eql("jane")
       expect(klass.config.db.pass).to eql("supersecret")
     end
+
+    it 'runs constructors' do
+      klass.setting :db do
+        setting :user, default: "root", constructor: ->(v) { v.upcase }
+        setting :sslcert, constructor: ->(v) { v&.values_at(:pem, :pass)&.join }
+      end
+
+      klass.config.update(db: {user: "jane", sslcert: {pem: "cert", pass: "qwerty"}})
+
+      expect(klass.config.db.user).to eql("JANE")
+      expect(klass.config.db.sslcert).to eql("certqwerty")
+    end
   end
 
   describe "#to_h" do