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This then became the Formatter class. And since this was a completely new feature, it only became available for use by opting into the 6.e.PREVIEW language version. And then it went largely unnoticed and uncared for the next 1.5 year. As clearly the time wasn't right for it yet.
This became one of the first things that needed to be done, to be able to say the new implementation would be matching the old. During the development of these tests, it became clear there were some inconsistencies in the existing implementation, and worse: outright bugs.