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taxo

0.2.0
0.2.0 0.1.0

Taxo is an Elixir port of the Clojure hierarchies provided by `derive` and `underive`.

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CHANGELOG.md 

This is a history of changes to rulvio/taxo



## 0.2.0 (2026-08-31)

* `Taxo.CyclicDerivationError`, raised by `derive/3` in place of a bare `RuntimeError`.

  Carries `:child` and `:parent`, so a caller can inspect what would have cycled instead

  of parsing a message.

* Every public function now requires a `%Taxo{}` struct and raises `FunctionClauseError`

  otherwise, rather than treating a bare map as an empty taxonomy.

* `@type t/0` and `@type tag/0`, and `@spec` on every public function.

* CI now runs on a version matrix (the declared floor, Elixir 1.18/OTP 27, and

  the current release, 1.20/29), plus a `quality` job that runs

  `mix format --check-formatted`, `mix credo --strict`, `mix deps.unlock

  --check-unused`, and `mix dialyzer`. The workflow moved from

  `.github/workflows/elixir.yml` to `ci.yml`.

* Added `credo`, with a strict `.credo.exs`, and tracked `mix.lock` so CI

  dependency versions are reproducible.

* `is_a?/3` now returns `true` when `child` and `parent` are the same tag, matching

  Clojure's `isa?`. Previously it only checked ancestry, so a tag was not `is_a?`

  itself.

* New README and `docs/hierarchies.md`, and clearer docs and comments throughout

  `lib/taxo.ex`.



## 0.1.0 (2025-03-17)

* Initial release