the serializer will check if keys are valid.
allow to specify if there what fields we wish to return as unserialized raw buffer.
serialize will not emit undefined fields (default:true)
when deserializing a Binary will return it as a node.js Buffer instance.
when deserializing a Long will fit it into a Number if it's smaller than 53 bits
when deserializing will promote BSON values to their Node.js closest equivalent types.
Return BSON filled buffers from operations
Specify a read concern for the collection. (only MongoDB 3.2 or higher supported)
The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST).
serialize the javascript functions (default:false).
Write Concern as an object
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return BSON regular expressions as BSONRegExp instances.