Quoted keys, strict comma rules, very limited data types, are the main ones. There are a host of others if you view it through the lenses of user-read/write, an

Quoted keys, strict comma rules, very limited data types, are the main ones. There are a host of others if you view it through the lenses of user-read/write, and a different set of issues if you view it as a machine data interface. Trying to combine the two seems fundamentally misguided.