Inconsistent behaviour of asserts when using the NF

[Francesco Casella]

Please consider ​Modelica.Electrical.Analog.Examples.OpAmps.Multivibrator. The following error is reported

assert            | warning | The following assertion has been violated at time 0.000250
|                 | |       | 1.0 + r.alpha * (r.T - r.T_ref) >= 1e-15

The flattened model contains the following declaration

  parameter Real r.alpha(quantity = "LinearTemperatureCoefficient", unit = "1/K") = 0.0 
  "Temperature coefficient of resistance (R_actual = R*(1 + alpha*(T_heatPort - T_ref))";

Now, if r.alpha = 0 then the expression inside the assert statement should be equal to 1.0, which is definitely greater than 1e-15.

Why is this assertion triggered?

[Francesco Casella]

This issue is no longer showing up, although the model breaks later during the simulation due to a system singularity.