Can pattern files include/import another one? I haven't really looked at any of this hyphenation stuff because I'm quite happy even without any hyphenation (or to put it another way, anything other than LaTeX is absolutely terrible at creating balanced paragraphs imho, even with decent patterns).
I think user-defined overrides should be in a separate file of some sort, because the standard hyphenation files would be overwritten by updates. And this JSON business is also questionable, except perhaps for the purposes of providing additional metadata. Alas, changing these things is more time-consuming than I'd like it to be.
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