message: i128_type feature has been stabilized in Rust.
diff: -// If the "u128-support" feature is enabled, this library can use
  -// more efficient arithmetic. Only available in the nightly compiler.
  -#![cfg_attr(feature = "u128-support", feature(i128_type))]
  // `clippy` is a code linting tool for improving code quality by catching
  // common mistakes or strange code patterns. If the `clippy` feature is
  // provided, it is enabled and all compiler warnings are prohibited.
  