This member is added by an implicit conversion from BasicMetadata[Id] to
any2stringadd[BasicMetadata[Id]] performed by method any2stringadd in scala.Predef.
This member is added by an implicit conversion from BasicMetadata[Id] to
StringFormat[BasicMetadata[Id]] performed by method StringFormat in scala.Predef.
Common metadata.
Type of the id of this file (generally
BSONObjectID
orBSONValue
).