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Doc Brown
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If you need some serialization code which is specific for certain Handler implementations, my first choice would be to make it part of the type itself and hence put into the same module where the specific Handler lives, so either core or extension. I would not discard that solution so quickly just because of a superstitious feeling of being "not correct".

If the code is separable from the Handler type, and core and extension become so large maintenance gets confusing, you may introduce two new modules coreSerializers and extensionSerializers and put the code there. As always, introducing more structure comes for the price for increased management efforts, so I would recommend against starting with this design - better refactor to this structure when the code base grows in this area.

Generic serialization code like HandlerSerializer<T: Handler>, however, can be placed in a neutral location, since it does not create a dependency on specific handler implementation. It could by either placed in persistence or in some new module serialization, whatever you prefer.

Doc Brown
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