Show warning message if passed string to 'Enabled' key in .rubocop.yml

It causes unexpected cop warnings because treats as truthy value if
passed neither true nor false in 'Enabled' key's value like
"Enabled: disable".  #7056

.rubocop_todo.yml

@@ -17,7 +17,7 @@ Metrics/AbcSize:
 # Offense count: 47
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 174
+  Max: 182
 
 # Offense count: 219
 # Configuration parameters: CountComments, ExcludedMethods.

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### New features
 
 * [#7274](https://github.com/rubocop-hq/rubocop/issues/7274): Add new `Lint/SendWithMixinArgument` cop. ([@koic][])
+* [#7272](https://github.com/rubocop-hq/rubocop/pull/7272): Show warning message if passed string to `Enabled`, `Safe`, `SafeAutocorrect`, and `AutoCorrect` keys in .rubocop.yml. ([@unasuke][])
 
 ### Bug fixes
 

lib/rubocop/config_loader.rb

@@ -199,6 +199,8 @@ def load_yaml_configuration(absolute_path)
           raise(TypeError, "Malformed configuration in #{absolute_path}")
         end
 
+        check_cop_config_value(hash)
+
         hash
       end
 
@@ -220,6 +222,22 @@ def check_duplication(yaml_code, absolute_path)
         end
       end
 
+      def check_cop_config_value(hash, parent = nil)
+        hash.each do |key, value|
+          check_cop_config_value(value, key) if value.is_a?(Hash)
+
+          next unless %w[Enabled
+                         Safe
+                         SafeAutoCorrect
+                         AutoCorrect].include?(key) && value.is_a?(String)
+
+          abort(
+            "Property #{Rainbow(key).yellow} of cop #{Rainbow(parent).yellow}" \
+            " is supposed to be a boolean and #{Rainbow(value).yellow} is not."
+          )
+        end
+      end
+
       # Read the specified file, or exit with a friendly, concise message on
       # stderr. Care is taken to use the standard OS exit code for a "file not
       # found" error.

spec/rubocop/config_loader_spec.rb

@@ -992,6 +992,24 @@ def cop_enabled?(cop_class)
       end
     end
 
+    context 'set neither true nor false to value to Enabled' do
+      before do
+        create_file(configuration_path, <<~YAML)
+          Layout/AlignArray:
+            Enabled: disable
+        YAML
+      end
+
+      it 'gets a warning message' do
+        expect do
+          load_file
+        end.to raise_error(
+          SystemExit,
+          /supposed to be a boolean and disable is not/
+        )
+      end
+    end
+
     context 'when the file does not exist' do
       let(:configuration_path) { 'file_that_does_not_exist.yml' }