Note that all the to_json functions are strict. In this sense it's quite consistent. If we change it to being called on null input, what should we return if a null non-scalar is passed in?
what is correct from JSON perspective? All fields with NULL
ISTM that the whole purpose of to_json is to properly jsonify something, and the proper json form for "undefined" is 'null', is it not?
it is probably equivalent
Pavel
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