PHPC-801: Always serialize RC, RP, and WC as BSON documents

Author: jmikola

src/MongoDB/ReadConcern.c

@@ -112,6 +112,7 @@ PHP_METHOD(ReadConcern, bsonSerialize)
 	}
 
 	php_phongo_read_concern_to_zval(return_value, read_concern);
+	convert_to_object(return_value);
 }
 /* }}} */
 

src/MongoDB/ReadPreference.c

@@ -211,6 +211,7 @@ PHP_METHOD(ReadPreference, bsonSerialize)
 	}
 
 	php_phongo_read_preference_to_zval(return_value, read_preference);
+	convert_to_object(return_value);
 }
 /* }}} */
 

src/MongoDB/WriteConcern.c

@@ -193,6 +193,7 @@ PHP_METHOD(WriteConcern, bsonSerialize)
 	}
 
 	php_phongo_write_concern_to_zval(return_value, write_concern);
+	convert_to_object(return_value);
 }
 /* }}} */