On: What is wrong with TOML? (2019)

[bonzini]

JSON was designed as a wire format, not as a configuration file. The original idea was to validate it with a regex to exclude malicious input and then eval() it. That explain why it's such a small subset.

TOML on the other hand is also a clear indication that Tom did not like using (or hadn't learned about) a formal grammar.

[carapace → bonzini]

JSON wasn't designed? It's just the literal notation from JS extracted, no?

And I don't thing you can validate JS with a regex? (Have I forgotten that much of formal language theory?)