Accept JSON5 as input

[yf-hk]

JSON is a pretty rigid format, even changes from double quotes to single quotes would fail its validation. It happened many times to me that what I really need to input is not a strict JSON but a Javascript Object. In this regards I think it would be quite convenient if we can add JSON5 as an input source, which is 100% compatible with standard JSON, but with steroids to make most normal Javascript Objects valid as well. For reference, here is the specification of JSON5 https://json5.org/