Konrad Schrempf reports the following bug:
(1) -> A := matrix([[0]])$Matrix(DFLOAT)
(1) [0.0]
Type: Matrix(DoubleFloat)
(2) -> rowEchelon(A)
(2) [0.0]
Type: Matrix(DoubleFloat)
(3) -> A := matrix([[-0$DFLOAT]])
(3) [-0.0]
Type: Matrix(DoubleFloat)
(4) -> rowEchelon(A)
>> Error detected within library code:
not invertible
(5) -> zero?(-0$DFLOAT)
(5) true
Type: Boolean
(6) -> zero?(0$DFLOAT)
(6) true
Type: Boolean
(7) -> (-0$DFLOAT ~= 0$DFLOAT)@Boolean
(7) true
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