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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

[1.0.0] - 2026-04-04

Breaking Changes

  • min() / max() now return Option<f64> instead of f64. Use .unwrap() or .unwrap_or(f64::NAN) to recover old behavior.
  • estimate_quantile() now returns Option<f64> instead of f64. Use .unwrap() or .unwrap_or(0.0) to recover old behavior.
  • mean() now returns Option<f64> instead of f64. Use .unwrap() or .unwrap_or(0.0) to recover old behavior.
  • new() now takes Option<f64> for min and max parameters. Wrap existing values in Some(...).
  • Eq removed from TDigest. Use PartialEq only.
  • #[non_exhaustive] added to TDigest and Centroid. Use constructors or Default instead of struct literals.
  • The ordered-float dependency has been removed. No action needed by consumers.
  • Serde wire format changed: The min and max fields are now Option<f64> (serialized as null when empty) instead of f64 (which used NaN as a sentinel). Data serialized with 0.2.x cannot be deserialized by 1.0.0 without manual migration.

Bug Fixes

  • Fixed merge_digests k_limit off-by-one: the first centroid bucket was absorbing more weight than intended because k_limit was not incremented after the initial q_limit_times_count computation.
  • Fixed hardcoded 100 in new() re-compression: when centroids exceeded max_size, the constructor ignored the caller-supplied max_size.
  • Fixed merge_digests empty-input losing max_size: previously returned TDigest::default() (max_size=100) instead of preserving the caller's max_size.

Improvements

  • Dropped ordered-float dependency; uses f64::total_cmp (stable since Rust 1.62).
  • Replaced custom clamp function with f64::clamp().
  • Replaced external_merge (~90 lines of custom merge sort) with centroids.sort().
  • Simplified merge_unsorted to sort in-place without intermediate allocation.
  • Added centroids() accessor to expose &[Centroid].
  • Added #[must_use] annotations to methods returning new values.
  • Added debug_assert validation in constructors for NaN and missing min/max.

Infrastructure

  • Removed Travis CI configuration.
  • Updated GitHub Actions CI: replaced deprecated actions-rs/* with dtolnay/rust-toolchain, added MSRV check job.
  • Declared MSRV as Rust 1.62 via rust-version in Cargo.toml.
  • Removed Cargo.lock from version control (library convention).