Sahil Sinha a5dccffa56 Add double and float support to scan test ...

- Add double_type and float_type to scan_type enum
- Add double* and float* pointers to scan_arg union
- Add constructors for double and float scan arguments
- Add switch cases for double and float types in visit()
- Implement basic read() functions for floating-point parsing

This partially resolves the TODO comment 'more types' in scan.h by adding
support for the two most commonly needed floating-point types.

2025-06-21 06:57:20 -07:00

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