(wip) use json, not pson, steal Bens work to make pup4 #1087
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Needs tests and to double check the documentation / its generation.
Wanted to know if there were any concerns with the approach though.
FWIW, I first tried to overwrite the existing method but we have tests that invalid inputs cause the default given to be output instead of failing with a type error (which the newer functions would do if properly typed).
Alternatively, I could loosen the typing to allow more backwards compat but there'll still be some incompatibility between JSON <-> PSON. The content of the 4x functions was stolen from Ben's PR #1079 and slightly cleaned up.