As the title says, the axis trait growth= isn't preserved currently in serialization roundtrips (somewhere here I suppose: https://github.com/scikit-hep/boost-histogram/blob/develop/src/boost_histogram/serialization/_axis.py).

Is it possible to preserve this? Or is there a conceptual problem with that?

For context: I'd like to make use of this in https://github.com/pfackeldey/haas, where I start a histogram gRPC server with an empty histogram (initialized through the serialization IR). A RPC histogram fill request should be able to grow axes of this initialized histogram.