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v0.1.0

Initial release.

  • %AshWeight{mg: integer} struct.
  • Ash.Type behaviour: storage as integer milligrams.
  • Constructors: new/2, from_mg/1, from_g/1, from_kg/1. Accept integer, float, Decimal, or numeric string. Decimal-based arithmetic prevents float drift.
  • Conversions: to_mg/1 (integer), to_g/1 and to_kg/1 (Decimal).
  • Arithmetic: add/2, subtract/2, multiply/2.
  • Comparison: compare/2, equal?/2.
  • Input casting: %AshWeight{}, integer, {value, unit} tuple, atom- or string-keyed map, nil.
  • Constraints: :min, :max (in mg).
  • String.Chars formats "250 mg", "1.5 g", "2.25 kg" by picking the largest unit that yields |value| >= 1.