Alright, I checked each Pharo version locally, and the failing tests don't seem to be related to my changes and they failed already in previous versions:

• PMNumericalMethodsTestCase>>#testOptimize is random from what I saw, it usually passes but sometimes it fails ?
• PMQRTest>>#testDecompositionOfMatrixCausingErraticFailure is expected to fail but passes in P11 and P12 for some reason
• In PMClusterFinderTest, #testClusterCovariance and #testClusterEuclidean fails for all except P11

So over all I think it's good to merge