v1.3.0 – Optional parameters & binary protocol optimization

Added

• Support for std::optional<T> and std::nullopt → automatic SQL NULL
• Full binary encoding for all numeric types (bool, int16/32/64, float, double)
• Mixed text/binary parameter support in exec_param_query_nonblocking
• Automatic OID inference for text parameters

Changed

• Replaced text-based numeric serialization with zero-allocation binary encoding

Performance

• Reduced parameter serialization overhead by up to ~35–45%
• Fewer heap allocations during query preparation

Compatibility

• Safe with any combination of argument types
• Backward compatible with existing query logic