While serde is the de facto standard for JSON in Rust, it's not actually in the standard library, so there's no one true "JSON document" type for the logger to

While serde is the de facto standard for JSON in Rust, it's not actually in the standard library, so there's no one true "JSON document" type for the logger to accept. Anyway, the point of the JSON serializer taking a writer is so that it can push tokens straight to an IO device (the network, in this case), one by one, without having to hold the entire abstract structure in memory. And even if you had a dedicated "JsonWriter" interface for streaming that validates on the way out, you'd have cases where a string is already known to be valid JSON but to send it you have to pay the cost of an extra validation for no good reason. I love me some strong, static types, but sometimes you gotta let bytes be bytes. The silently dropping bad input, yeah, that part was just bad developer experience on the vendor's part.