Changelog

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All notable changes to this project are documented in this file.

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

Unreleased

0.2.1 - 2026-10-03

Changed

  • Requires Mutare 0.5 ({:mutare, "~> 0.5.0"}).

0.2.0 - 2026-09-26

Changed

  • Breaking: Mutare 0.4.1 or newer is required ({:mutare, "~> 0.4.1"}). The families read a pipe stage as the direct call it is sugar for, which 0.4.0 offers them; under an older core they match nothing.
  • A pipe stage gets every mutant the direct call gets. The piped value is the call's first argument, so the mutants that used to need it written out now reach the piped spelling too: a |> Decimal.sub(b) is reversed to b |> Decimal.sub(a) (:decimal_arithmetic, and :decimal_comparison for compare/cmp), a |> Decimal.div_rem(b) is rebuilt in the wrong tuple order (:decimal_div_rem), 1 |> Decimal.new(coef, exp) has its sign flipped (:decimal_sign), and context |> Decimal.Context.set() becomes :ok (:decimal_context).
  • A removed pipe stage collapses to what is piped into it. :decimal_transform now reports num |> Decimal.normalize() → num, where it reported Decimal.normalize() → Elixir.Function.identity(). The mutant is the same program.

0.1.0 - 2026-09-07

Initial release.

Added

  • Eleven mutator families over the Decimal call surface, each reported under its own name and independently enable-able:
    • Mutare.Decimal.Arithmetic (:decimal_arithmetic) — swaps same-arity arithmetic calls (add/sub/mult/div/div_int/rem) and reverses visible operands of the non-commutative ones.
    • Mutare.Decimal.Comparison (:decimal_comparison) — swaps comparison predicates (gt?/gte?/lt?/lte?), min/max, and reverses operands of compare/2,3 and the deprecated cmp/2.
    • Mutare.Decimal.Classification (:decimal_classification) — swaps classification predicates (positive? ↔ negative?, nan? ↔ inf?).
    • Mutare.Decimal.ZeroBoundary (:decimal_zero_boundary) — replaces positive?/negative? with inclusive zero-boundary comparisons.
    • Mutare.Decimal.Sign (:decimal_sign) — swaps abs/1 ↔ negate/1 and flips literal signs in Decimal.new/3.
    • Mutare.Decimal.DivRem (:decimal_div_rem) — rebuilds div_rem/2 with the quotient/remainder pair in the wrong tuple order.
    • Mutare.Decimal.Transform (:decimal_transform) — removes value-transforming calls (normalize, apply_context, abs, negate, sqrt, round/1,2,3).
    • Mutare.Decimal.ModeSwap (:decimal_mode_swap) — swaps round/3 rounding modes and to_string/2,3 output formats.
    • Mutare.Decimal.DefaultDrop (:decimal_default_drop) — drops refinement/default arguments (round/2,3, compare/3, eq?/3).
    • Mutare.Decimal.LimitsDrop (:decimal_limits_drop) — drops parsing/rendering limit arguments (parse/2, cast/2, new/2, to_string/2,3).
    • Mutare.Decimal.Context (:decimal_context) — removes Decimal.Context.with/set/update effects.
  • Calls match written qualified, aliased, imported, or as a pipe stage.
  • Ignore-variant labels on every mutation (target operation, mode, dropped argument, or operation kind), so # mutare:ignore[family:label] can suppress a single variant.
  • Mutare.Decimal.all/0 for splicing all families into a :mutators list.

Supports Decimal >= 2.2.0 and < 4.0.0.