args ) {
		if ( $args['single'] ) {
			$schema = $args['schema'];
		} else {
			$schema = $args['schema']['items'];
		}

		if ( '' === $value && in_array( $schema['type'], array( 'boolean', 'integer', 'number' ), true ) ) {
			$value = static::get_empty_value_for_type( $schema['type'] );
		}

		if ( is_wp_error( rest_validate_value_from_schema( $value, $schema ) ) ) {
			return null;
		}

		return rest_sanitize_value_from_schema( $value, $schema );
	}

	/**
	 * Check the 'meta' value of a request is an associative array.
	 *
	 * @since 4.7.0
	 *
	 * @param mixed           $value   The meta value submitted in the request.
	 * @param WP_REST_Request $request Full details about the request.
	 * @param string          $param   The parameter name.
	 * @return array|false The meta array, if valid, false otherwise.
	 */
	public function check_meta_is_array( $value, $request, $param ) {
		if ( ! is_array( $value ) ) {
			return false;
		}

		return $value;
	}

	/**
	 * Recursively add additionalProperties = false to all objects in a schema if no additionalProperties setting
	 * is specified.
	 *
	 * This is needed to restrict properties of objects in meta values to only
	 * registered items, as the REST API will allow additional properties by
	 * default.
	 *
	 * @since 5.3.0
	 * @deprecated 5.6.0 Use rest_default_additional_properties_to_false() instead.
	 *
	 * @param array $schema The schema array.
	 * @return array
	 */
	protected function default_additional_properties_to_false( $schema ) {
		_deprecated_function( __METHOD__, '5.6.0', 'rest_default_additional_properties_to_false()' );

		return rest_default_additional_properties_to_false( $schema );
	}

	/**
	 * Gets the empty value for a schema type.
	 *
	 * @since 5.3.0
	 *
	 * @param string $type The schema type.
	 * @return mixed
	 */
	protected static function get_empty_value_for_type( $type ) {
		switch ( $type ) {
			case 'string':
				return '';
			case 'boolean':
				return false;
			case 'integer':
				return 0;
			case 'number':
				return 0.0;
			case 'array':
			case 'object':
				return array();
			default:
				return null;
		}
	}
}