chore: release v0.20.0

[YeungOnion]

🤖 New release

• statrs: 0.19.1 -> 0.20.0 (⚠ API breaking changes)

⚠ statrs breaking changes

--- failure feature_no_longer_enables_feature: package feature no longer enables another feature ---

Description:
A feature no longer enables another feature in this package's Cargo.toml. This will break downstream crates which rely on the implied feature being enabled.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#cargo-feature-remove-another
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/feature_no_longer_enables_feature.ron

Failed in:
  feature nalgebra no longer enables std

Changelog

0.20.0 - 2026-09-07

Added

• Support alloc-backed APIs in no_std (#403)

Fixed

• return None from Empirical::variance for a single sample
• Triangular::pdf returns NaN when mode equals min
• Finish large beta edge handling
• Preserve asymmetric beta tails
• Preserve beta values near one
• Handle extreme beta tails
• Handle beta log boundaries
• Stabilize large beta CDF
• ensure special cases evaluate only for exact inputs
• ULPs comparisons should only regard ULPs in prec module
• guard LogNormal::pdf on both ends and fix ln_pdf for extreme x
• keep the left tail of LogNormal::pdf
• Preserve gamma PDF accuracy
• use frexp for evaluating ln(a*b)
• preserve NaN for Gamma pdf(0) when rate is infinite
• Stabilize gamma PDF evaluation
• restore full precision to erf's interval constants
• Update kdtree and KDE radius
• accumulate central moments relative to the first observation
• compute FisherSnedecor pdf in log space for large freedoms
• Unblock release-plz
• make Geometric cdf(1)/inverse_cdf(p) exact and portable
• correct Geometric::inverse_cdf against its definition
• compute Hypergeometric pmf in log space for large populations

Other

• Cut the doc note too
• Drop the explanatory comments and split out the endpoint tests
• Allow beta tail rounding
• update prec ULPs docs for clarity around use case
• Assert directly in test_pdf_left_tail instead of collecting failures
• Cover frexp edge cases
• (gamma) small suite for rate*x near 1 cases
• (doc) clippy
• (online) guidance/suggestion for merge
• build the OnlineMoments offset tests under no_std
• Source large-freedom pdf fixtures from mpmath instead of SciPy
• (deps) bump actions/checkout from 4 to 7
• drop overexplanation implementation

---

This PR was generated with release-plz.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.83%. Comparing base (52248ee) to head (f5b7643).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #439   +/-   ##
=======================================
  Coverage   95.83%   95.83%           
=======================================
  Files          68       68           
  Lines       16658    16658           
=======================================
  Hits        15965    15965           
  Misses        693      693           

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---

📝 Walkthrough

Walkthrough

The release metadata updates the package to version 0.19.2, upgrades dependencies, updates the lockfile, and adds the 0.19.2 changelog entry dated 2026-08-26.

Changes

Release metadata

Layer / File(s)	Summary
Version and dependency update Cargo.toml, Cargo.lock.MSRV	The package version changes to 0.19.2. The optional kdtree dependency changes to 0.8.1. The lockfile updates kdtree, statrs, and shared thiserror entries.
Changelog update CHANGELOG.md	The changelog records the 0.19.2 release, fixes, and maintenance changes.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 6353f

This release updates package versions, changelog content, and numerical-library behavior without any identified merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title describes a release, which matches the changeset, but it names version 0.20.0. The package, changelog, and PR objective all release version 0.19.2.	Change the title to chore: release v0.19.2.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch release-plz-2026-08-11T19-36-43Z

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