when:
        def json = '{ "_id" : { "$binary" : "QUJSV1RJRkdQRWVTRmY2OWZJU0FPQT09", "$type" : "3" } }'
        def bdoc = BsonDocument.parse(json)

        then:
        bdoc.toJson() == json

        then:
        def bin = bdoc.getBinary("_id")
        bin.data.size() == 16 // FAILS

Document.parse('{ "_id" : { "$binary" : "QUJSV1RJRkdQRWVTRmY2OWZJU0FPQT09", "$type" : "03" } }')

org.bson.BsonSerializationException: Expected length to be 16, not 24.
	at org.bson.codecs.UuidCodec.decode(UuidCodec.java:100)
	at org.bson.codecs.UuidCodec.decode(UuidCodec.java:36)
	at org.bson.codecs.DocumentCodec.readValue(DocumentCodec.java:212)
	at org.bson.codecs.DocumentCodec.decode(DocumentCodec.java:141)
	at org.bson.codecs.DocumentCodec.decode(DocumentCodec.java:45)
	at org.bson.Document.parse(Document.java:105)
	at org.bson.Document.parse(Document.java:90)
	at org.bson.BsonDocumentSpecification.test parse(BsonDocumentSpecification.groovy:287)