tags: TagLine constructor now supports multiline taglines and multiple spaces

chatmastermind/message.py

@@ -2,8 +2,8 @@
 Module implementing message related functions and classes.
 """
 import pathlib
-from typing import Type, TypeVar, Optional, Any
-from dataclasses import dataclass, asdict
+from typing import Type, TypeVar, Optional, Any, Final
+from dataclasses import dataclass, asdict, field
 from .tags import Tag
 
 QuestionInst = TypeVar('QuestionInst', bound='Question')
@@ -95,7 +95,7 @@ class Message():
     answer: Optional[Answer]
     tags: Optional[set[Tag]]
     file_path: Optional[pathlib.Path]
-    file_suffixes: list[str] = ['.txt', '.yaml']
+    file_suffixes: Final[list[str]] = field(default_factory=lambda: ['.txt', '.yaml'])
 
     # @classmethod
     # def from_file(cls: Type[MessageInst], file_path: pathlib.Path) -> MessageInst: