Fixed behavior of default fn in dump and dumps.

Author: alexreg

json5/lib.py

@@ -19,7 +19,6 @@
 
 from .parser import Parser
 
-
 if sys.version_info[0] < 3:
     str_types = (str, unicode)
     str = unicode  # pylint: disable=redefined-builtin, invalid-name
@@ -316,7 +315,12 @@ def _dumps(obj, skipkeys, ensure_ascii, check_circular, allow_nan, indent,
                         allow_duplicate_keys, seen, level,
                         item_sep, indent_str, end_str)
     else:
-        s = default(obj)
+        s = _dumps(default(obj), skipkeys, ensure_ascii,
+                   check_circular, allow_nan, indent,
+                   separators, default, sort_keys,
+                   quote_keys, trailing_commas,
+                   allow_duplicate_keys, seen, level,
+                   is_key)
 
     if seen is not None:
         seen.remove(i)