Considering a class property with a default value,
when reading the class from BSON if there is no BSON value
corresponding to the property, then the default value is used.
This member is added by an implicit conversion from ReadDefaultValues to
any2stringadd[ReadDefaultValues] performed by method any2stringadd in scala.Predef.
This member is added by an implicit conversion from ReadDefaultValues to
StringFormat[ReadDefaultValues] performed by method StringFormat in scala.Predef.
Considering a class property with a default value, when reading the class from BSON if there is no BSON value corresponding to the property, then the default value is used.