Thisversion: Keep schema history out of your application model

Persisted data often outlives the code that wrote it. As an application evolves, its stored fields and their meanings change too. I built thisversion to keep that history in versioned schema types, while letting application code use one current model. The idea for this library came from my place of work, where managing backwards compatibility became increasingly burdensome as our types accumulated changes over the years. I cleaned up and documented the approach so it could be useful to other Ru...