**System Information**

Operating system: Windows-10-10.0.19041-SP0 64 Bits

Graphics card: GeForce GTX 1080 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

**Short description of error**

Can not create a child of constraint and set it's inverse matrix in python due to the automatic execution of inverse matrix calculation introduced by this commit rBad70d4b0956f5f06f45414cdfae2e2dc19505d71

**Exact steps for others to reproduce the error**

Run the included script,

Check the constraint's inverse matrix by running this in the console

C.object.constraints['Child Of'].inverse_matrix

It will give you the following matrix:

Matrix(((1.0, -0.0, 0.0, -0.0), (-0.0, 1.0, -0.0, 0.0), (0.0, -0.0, 1.0, -0.0), (-0.0, 0.0, -0.0, 1.0)))

Which is different than the one the script tried to set:

constraint.inverse_matrix = ((-1.0, -0.0, 0.0, -0.0), (-0.0, -1.0, -0.0, 0.0), (0.0, -0.0, 1.0, -0.0), (-0.0, 0.0, -0.0, 1.0))