test: migrate stats/base/dists/binomial/kurtosis to ULP-based assertions

[Planeshifter]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates the tests for stats/base/dists/binomial/kurtosis from relative tolerance testing to ULP difference testing, replacing the abs( y - expected[i] ) <= tol comparisons with @stdlib/assert/is-almost-same-value. The idiom mirrors the already-migrated sibling package stats/base/dists/binomial/entropy.

Files changed: test/test.js and test/test.native.js. No non-test files are modified, and no test fixtures, expected values, or test cases were added, removed, or altered.

Every fixture-driven comparison in this package resolves exactly (ULP = 0), for both the JavaScript and native implementations, even though the original tolerance code allowed 1.0 * EPS (JS) and 30.0 * EPS (native).

File	Fixture assertions	ULP	Previous tol multiplier
test/test.js	200	0	1.0 * EPS
test/test.native.js	200	0	30.0 * EPS

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

The bound was measured directly, not just probed via test runs: for every fixture, the actual output was computed by requiring the package's lib/main.js (JS) and lib/native.js (compiled native add-on, built locally via make install-node-addons NODE_ADDONS_PATTERN="stats/base/dists/binomial/kurtosis") implementations directly and diffing against the expected fixture values with @stdlib/number/float64/base/ulp-difference; the maximum observed ULP difference was 0 across all 200 fixtures for both implementations. The full test suite (test/test.js, test/test.native.js) was then run twice at ULP = 0 with identical, fully passing results (214 and 210 assertions respectively), confirming determinism.

Checklist

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• Read, understood, and followed the contributing guidelines.

AI Assistance

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• No

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This PR was authored by Claude Code, running as a scheduled/automated session. The migration follows the idiom established in the already-migrated stats/base/dists/binomial/entropy, and the ULP bounds were measured empirically (via direct ULP-difference computation against the fixtures for both the JS and native implementations) rather than guessed.

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https://claude.ai/code/session_01NbgTEygiUMqVkNd2aUhcoU

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/binomial/kurtosis	$\\color{green}178/178$ $\\color{green}+100.00\\%$	$\\color{green}12/12$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}178/178$ $\\color{green}+100.00\\%$

The above coverage report was generated for the changes in this PR.

[Planeshifter]

⚠️ Issue Reference Review

An automated check found potentially unrelated issue/PR references in this PR:

Reference	Assessment	Reasoning
#11352	suspicious	Issue #11352 is an RFC explicitly scoped to migrating math/base/special packages from relative-tolerance to ULP-based testing (its own instructions say to search for a package "in math/base/special"). This PR migrates tests for stats/base/dists/binomial/kurtosis, which is outside the issue's stated scope.

Why this matters: GitHub automatically closes issues referenced with
closing keywords (Resolves, Closes, Fixes) when the PR is merged. Incorrect
references can accidentally close unrelated issues.

What to do:

• If the reference is correct, no action needed. This check may produce
  false positives.
• If the reference is incorrect, please update your PR description.

This assessment was generated by an AI model and is informational only.

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