Fix psalm issues.

Author: colinmurphy

plugins/hwp-previews/src/Admin/Settings/Fields/Field/Abstract_Settings_Field.php

@@ -99,6 +99,8 @@ public function get_description(): string {
 	 * @param string               $section The settings section.
 	 * @param string               $page The settings page.
 	 * @param array<string, mixed> $args The arguments for the settings field.
+	 *
+	 * @psalm-suppress ArgumentTypeCoercion
 	 */
 	public function add_settings_field( string $section, string $page, array $args ): void {
 		add_settings_field(

plugins/hwp-previews/src/Admin/Settings_Page.php

@@ -59,7 +59,7 @@ public static function init(): Settings_Page {
 		/**
 		 * Fire off init action.
 		 *
-		 * @param self $instance the instance of the plugin class.
+		 * @param Settings_Page $instance the instance of the plugin class.
 		 */
 		do_action( 'hwp_previews_init', self::$instance );
 
@@ -118,12 +118,13 @@ public function get_current_tab( array $post_types, string $tab = 'tab' ): strin
 			return '';
 		}
 		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Nonce verification not required for tab selection.
-		if ( ! array_key_exists( $tab, $_GET ) ) {
+		$value = $_GET[ $tab ] ?? '';
+		if ( ! is_string( $value ) || '' === $value ) {
 			return (string) key( $post_types );
 		}
 
 		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Nonce verification not required for tab selection.
-		return sanitize_key( $_GET[ $tab ] );
+		return sanitize_key( $value );
 	}
 
 	/**