Make Built-in fluent functions accept arbitrary number of positional arguments

Author: zrekryu

fluent.runtime/fluent/runtime/builtins.py

@@ -6,7 +6,7 @@
 DATETIME = fluent_date
 
 
-BUILTINS: Dict[str, Callable[[Any], FluentType]] = {
+BUILTINS: Dict[str, Callable[..., FluentType]] = {
     "NUMBER": NUMBER,
     "DATETIME": DATETIME,
 }