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Comment From: wilkinsona
Thanks for the suggestion.
I assume you're referring to https://json5.org? As far as I can tell, it has yet to gain much traction in the Java ecosystem. We haven't seen any other requests for JSON5 support and there doesn't appear to be a widely-used JSON 5 parser for the JVM. As such, I don't think we should add JSON5 support.
You may want to look at supporting it yourself. To do so, you would have to implement org.springframework.boot.env.PropertySourceLoader and register it through an entry in META-INF/spring.factories.