fastnum

Eliminates rounding errors such as 0.1 + 0.2 = 0.3, which is critical for financial and crypto applications as emphasized in the README's overview.

Uses fixed-size integers to avoid dynamic allocation, making types trivially copyable and improving cache-friendliness, demonstrated in allocation benchmarks where it outperforms bigdecimal.

Supports ±0, ±Infinity, and NaN with standard semantics, enabling robust error handling in mathematical operations as listed in the features.

Most methods are const, allowing compile-time parsing and calculations, enhancing performance and safety for known values, as highlighted in the 'Why fastnum?' section.