Feature request: json_as_blob
val with_json_as_blob : 'a encoding -> 'a encoding
no-op in binary
in json it encodes as a hex-encoded string of the binary representation
useful for values which are very abstract or really not intended to be human readable
Maybe we want to wrap it differently, the main use would probably be as obj1 (req "<name>" (with_json_as_blob <e>))