dashu-int 0.6.0

Arbitrary-precision integer math library for Rust, balancing ergonomics and efficiency. Provides UBig and IBig (unsigned and signed), with small values inlined on the stack. Efficient arithmetic, modular arithmetic, and number theory (pow, ilog, gcd, gcd_ext); two's-complement bit operations; parsing and formatting in base 2-36; optional serde, rand, num-traits, rkyv, and zeroize.
Documentation 
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//! Declare the `force_bits` cfg that the test workflow sets via
//! `RUSTFLAGS=--cfg force_bits=...` (16/32/64) so the matrix can exercise
//! the alternative `Word` widths. Without this declaration, stable Rust's
//! `unexpected_cfgs` lint (added by default in 1.80) fires on the three
//! `#[cfg(force_bits = "...")]` sites in `src/arch/mod.rs`.
fn main() {
    // Single-colon `cargo:` form for portability. The directive itself
    // was stabilised in Rust 1.80; older cargo (down to our MSRV) just
    // silently ignores unknown `cargo:` directives, which is fine because
    // the `unexpected_cfgs` lint they'd suppress doesn't exist at older
    // versions either.
    println!(r#"cargo:rustc-check-cfg=cfg(force_bits, values("16", "32", "64"))"#);
}