Is your feature request related to a problem or challenge? Please describe what you are trying to do.

As mentioned here, most data types for cast_to_variant have already been implemented. However, the current implementation could be refactored to improve readability and maintainability.

Describe the solution you'd like

Proposed refactor includes:

• Grouping related data types together (e.g., numeric types, temporal types).
• Extracting large code snippets from match branches into helper functions.
• Reordering tests to align with the data type order.

Describe alternatives you've considered

Additional context