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Mutable Default Argument:
Issue: The original code used provider_configs: dict = {} as a default argument. This could lead to unintended side effects due to Python's handling of mutable defaults.
Fix: Changed provider_configs to None and initialized it with {} inside the method.
Repetitive Validation:
Issue: Both Client and Completions contained redundant logic for provider validation.
Fix: Centralized validation logic into _validate_provider_key and reused it.
Unclear Error Handling:
Improved error messages for easier debugging.
Lazy Initialization:
Ensured lazy initialization for properties (chat and completions).