The TypeChecker implementation was becoming quite large, so it has been
refactored into several modules:
- `context`: Handles type checking contexts and inference access.
- `inference`: Contains the core Hindley-Milner inference logic
(unification, generalization, etc.).
- `finalize`: Manages the finalization step, applying substitutions and
dispatching hooks.
- `check`: Implements the main type checking logic for AST nodes.
This modularization improves code organization and maintainability.
Brummel
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