Changelog

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.