return BSON regular expressions as BSONRegExp instances.
the serializer will check if keys are valid.
allow to specify if there what fields we wish to return as unserialized raw buffer.
Force server to assign _id values instead of driver.
serialize will not emit undefined fields (default:true)
A primary key factory object for generation of custom _id keys.
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).
Should retry failed writes
serialize the javascript functions (default:false).
Write Concern as an object
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If the database authentication is dependent on another databaseName.