Add cast_booleans configuration option to Radio fieldtype

resources/lang/en/fieldtypes.php

@@ -58,6 +58,7 @@
     'markdown.config.parser' => 'The name of a customized Markdown parser. Leave blank for default.',
     'markdown.config.restrict' => 'Prevent users from navigating to other folders.',
     'markdown.config.smartypants' => 'Automatically convert straight quotes into curly quotes, dashes into en/em-dashes, and other similar text transformations.',
+    'radio.config.cast_booleans' => 'Options with values of true and false will be saved as booleans.',
     'radio.config.inline' => 'Show the radio buttons in a row.',
     'radio.config.options' => 'Set the array keys and their optional labels.',
     'range.config.append' => 'Add text to the end (right-side) of the slider.',

src/Fieldtypes/Radio.php

@@ -22,6 +22,13 @@ protected function configFieldItems(): array
                 'type' => 'toggle',
                 'width' => 50,
             ],
+            'cast_booleans' => [
+                'display' => __('Cast Booleans'),
+                'instructions' => __('statamic::fieldtypes.radio.config.cast_booleans'),
+                'type' => 'toggle',
+                'default' => false,
+                'width' => 50,
+            ],
         ];
     }
 
@@ -31,4 +38,30 @@ public function augment($value)
 
         return new LabeledValue($value, $label);
     }
+
+    public function preProcess($value)
+    {
+        if ($this->config('cast_booleans')) {
+            if ($value === true) {
+                return 'true';
+            } elseif ($value === false) {
+                return 'false';
+            }
+        }
+
+        return $value;
+    }
+
+    public function process($value)
+    {
+        if ($this->config('cast_booleans')) {
+            if ($value === 'true') {
+                return true;
+            } elseif ($value === 'false') {
+                return false;
+            }
+        }
+
+        return $value;
+    }
 }