BigDecimal raises an error when trying to divide by a non-numeric value, even if it defines #coerce. This is inconsistent with other numeric types and with the other operators in BigDecimal, which properly coerce the value.

Trivial example that reproduces the problem:

class MyNum
  def *(other)
    33
  end

  def /(other)
    99
  end

  def coerce(other)
    [MyNum.new, self]
  end
end

> 10.to_d * MyNum.new
33
> 10.0 / MyNum.new
99
> 10.0.to_d / MyNum.new
MyNum can't be coerced into BigDecimal