Add missing decoder case for NaN

[danieka]

When running against our Mongo instance we got the following error:

%FunctionClauseError{module: BSON.Decoder, function: :type, arity: 2, kind: nil, args: nil, clauses: nil}

Turns out that, at least for our Mongo installation, this case is used for NaN. I have validated that the value is NaN in Mongo Compass and adding this case results in the document being deserialised to the same values as in Compass.

[zookzook]

This is interesting. Could you provide the version of the MongoDB? The only different is, that the sign bit is set to 1.

[zookzook]

Thank you!

[danieka]

@zookzook We use MongoDB 7.3.3 Enterprise, but this could also be related to the library we use for writing to Mongo, but I don't know what we use there.