[tadfisher]

Or super-great, because decoders can't fail on nested messages they don't parse. This is a perennial problem in the large corpus of JSON we parse at my day job, and it would be fairly awesome to treat all nested objects as thunks to be decoded on access instead of crashing when synchronizing a crapton of JSON-encoded application state.

[c-cube]

Funny, I have the opposite view. If you have invalid data, you should fail as early and loudly as possible, not wait until it's decoded later and you have no idea where the faulty data comes from.

[morelisp]

I have both views - if you're going to do something with the data yes please reject as soon as possible - but also it sure is nice to be able to make a dumb pipe for either efficiency or architecture reasons sometimes.