Changelog

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

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

0.0.5 - 2026-09-22

🚀 Features

• iter: add the iter module: chunk, min_max and first_duplicate
• validate: add the validate module: is_valid_email, is_uuid and is_slug

📝 Documentation

• agents: list the iter and validate modules in llms.txt
• add the Scorecard badge and the iter/validate modules to the README
• add # Arguments and # Returns to every helper’s rustdoc

✅ Tests

• iter: exclude two equivalent mutants in min_max

0.0.4 - 2026-09-21

🚀 Features

• duration: add the duration module: parse, format and ParseDurationError
• map: add the map module: pick, omit and map_values

📝 Documentation

• agents: list the duration and map modules in llms.txt

✅ Tests

• map: bind the expected value so the test compiles on Rust 1.85

0.0.3 - 2026-09-21

🚀 Features

• array: add key_by, duplicates and interleave
• number: add the number module: lerp, round_to, mean, median, percentage, gcd, lcm
• string: add title_case, constant_case, squish, indent and unescape_html

📝 Documentation

• agents: list the new helpers in llms.txt
• add the Codecov badge to the README
• rewrite the README and point the homepage to helpers4.dev/rust
• add the pre-1.0 notice to the README and fix its install section

✅ Tests

• number: exclude the mutants that only hang
• number: cover lcm(0, 0)

👷 CI/CD

• add the OpenSSF Scorecard workflow
• notify the website when a release is published

0.0.2 - 2026-09-20

🚀 Features

• cache: add ExpiringMap
• http: add bearer_token
• net: add is_valid_hostname and HostnameError
• net: add is_public_ip
• time: add unix_now_millis
• time: add unix_now and ClockError

🐛 Bug Fixes

• net: reject hostnames whose last label is a number

🔧 Miscellaneous

• ignore the VS Code local history

♻️ Refactoring

• hex: name the hex parameter hex instead of s
• net: make the CIDR prefix precondition explicit

📝 Documentation

• net: spell out what is_public_ip guarantees and what it cannot know
• document the ExpiringMap capacity bound and the unix_now_millis saturation

✅ Tests

• cache: check that a non-empty map is not empty
• benchmark is_public_ip and ExpiringMap

👷 CI/CD

• exclude the equivalent ExpiringMap sweep-guard mutant
• publish with trusted publishing only

[0.0.1] - 2026-09-19

🚀 Features

• array: add cartesian_product
• array: add group_by
• array: add count_by
• array: add equals_unordered
• array: add intersects
• array: add symmetric_difference
• array: add intersection
• array: add difference
• array: add unique_by
• array: add unique
• env: add remove
• env: add set and InvalidKeyError
• env: add get
• env: add parse
• hex: add decode_array
• hex: add decode_to_slice
• hex: add decode and DecodeError
• hex: add encode_upper
• hex: add encode
• string: add escape_html
• string: add dedent
• string: add truncate
• string: add slugify
• string: add kebab_case
• string: add snake_case
• string: add pascal_case
• string: add camel_case
• scaffold crate with string::capitalize

🔧 Miscellaneous

• drop the redundant helpers4 scope

♻️ Refactoring

• string: colocate tests, property tests and benches with each helper
• adopt a strict lint table

📝 Documentation

• agents: describe the CI checks and the reusable workflows
• agents: note that coverage counts each generic instantiation
• release: accept an org-level token and make the environment optional
• string: drop the Since marker in favor of a computed api-since.json
• string: list the string helpers in llms.txt

✅ Tests

• array: benchmark unique, difference, group_by and equals_unordered
• hex: benchmark encode and decode
• string: benchmark the case, slug, escape and dedent helpers

📦 Build

• anchor the published file patterns to the crate root
• publish only sources, benchmarks and entry-point docs

👷 CI/CD

• simplify the release inputs
• drop the website notification from the release workflow
• add the crates.io release workflow
• confirm suspected benchmark regressions before reporting them
• say so when a diff generates no mutant
• raise the benchmark noise threshold to avoid false regressions
• add benchmark and mutation-testing jobs
• configure cargo-mutants
• run the minimal-versions job on nightly despite rust-toolchain.toml
• split CI into reusable jobs with PR and main validation