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lib/unit_fun/maths/add_subtract_maths.ex
defprotocol UnitFun.Maths.AddSubtractMaths do
@fallback_to_any true
def add(units, left, right)
def subtract(units, left, right)
end
defimpl UnitFun.Maths.AddSubtractMaths, for: Any do
def add(_, left, right), do: left + right
def subtract(_, left, right), do: left - right
end