Is it that an academic property, or are people serious about throwing JSON into running software that parses YAML and expect good results?
(Should I add: on production, because I want my tools to be used on production, but that's just me)
Hm, what JSON documents have a different meaning in YAML? I'd have hoped that with all names & strings being quoted and leading zeros being disallowed, that wouldn't be the case.
On the sense that any JSON file is a valid YAML file.
But absolutely not in the sense that you can just treat your json file as YAML and expect it to contain the correct data.