Improved dispatchers with richer results and added predicate and regular expression based dispatchers

source/data/field-configuration-factories.mjs

@@ -15,6 +15,12 @@ export function typed_value(coercion_function, default_value, description) {
 	return new Field_Configuration(null, coercion_function, () => default_value, description);
 }
 
+export function boolean(default_value, description) {
+	//BUG: Text representations such as "false" is still truthy here - we should have a more capable coearcing function
+	return new Field_Configuration(null, Boolean, () => default_value, description);
+}
+
+
 export function typed_factory(coercion_function, factory_function, description) {
 	return new Field_Configuration(null, coercion_function, factory_function, description);
 }

source/data/string-utilities.mjs

@@ -46,6 +46,6 @@ export function *indented_line_iterator(settings, text) {
 			break;
 		}
 		default:
-			throw new Error('Unsupported indention mode');	//TODO - proper error
+			throw new Error(`Unsupported indention mode: ${settings.indention_mode}`);	//TODO - proper error
 	}
 }