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Why isn't this feature part of Core 2.4?
I am not expert, but I think this will be named "model", and how to acces it could be nice with Registry or function to load you model (In this case php file into class/ ) like xoops_getmodulehandler() not as Helper.
"Helper" definition could be a snippet or "Utility functions" for specific topic that reduce the redundancy of code.
I will contact you