I have worked in a place where we had to use Intersystems Caché Objectscript, which is a variant of Mumps. It was terrible. For example, it was nearly impossibl

I have worked in a place where we had to use Intersystems Caché Objectscript, which is a variant of Mumps. It was terrible. For example, it was nearly impossible to use source code control. We also tried introducing a unit test framework to add some stability, but it turned out the .NET gateway we tried to use to this purpose, wasn't thread-safe, had side effects, kept state in mysterious ways. Restarting the cache' (sic) process was often the only solution after the server totally collapsed while the automatic integration tests were running. If course this was all our own fault for not understanding the product properly, as Intersystems would often reply. At the time, it was not funny. I'm glad I left.