[maxbond]

I think parsing BSON is simpler than parsing JSON, BSON has additional types but the top level is always a document. Whereas the following are all valid JSON:

- `null`

- `"hello"`

- `[1,2,NaN]`

Additionally, BSON will just tell you what the type of a field is. JSON requires inferring it.

[zokier]

NaN is not part of JSON by any spec. Top level scalar values were disallowed by RFC 4627.

[maxbond]

Fair enough. I'm not sure how much JSON parsers in the wild care about that spec. I just tried with Python and it was happy to accept scalars and NaN. JavaScript rejected NaN but was happy to accept a scalar. But sure, compliant parsers can disregard those cases.