The MongoDB\BSON\Serializable interface
MongoDB\BSON\Serializable
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Classes that implement this interface may return data to be serialized as a
BSON array or document in lieu of the object's public properties.
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MongoDB\BSON\Serializable
MongoDB\BSON\Serializable
MongoDB\BSON\Type
&Methods;
&reference.mongodb.bson.entities.serializable;