Is agtype like json? Casting agtype to json - list of vertices or edges? about age HOT 1 OPEN

issue1996=# SELECT * FROM cypher('issue1996', $$ CREATE (a:NODE {key1: "prop1", key2:"prop2"}) $$) as (a agtype);
 a 
---
(0 rows)

issue1996=# SELECT * FROM cypher('issue1996', $$ MATCH (a) return a$$) as (a json);
                                             a                                              
--------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "NODE", "properties": {"key1": "prop1", "key2": "prop2"}}
(1 row)
issue1996=# SELECT cast(a as json) FROM cypher('issue1996', $$ MATCH (a) return a$$) as (a agtype);
                                             a                                              
--------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "NODE", "properties": {"key1": "prop1", "key2": "prop2"}}
(1 row)

issue1996=# SELECT pg_typeof(a) FROM cypher('issue1996', $$ MATCH (a) return a$$) as (a json);
 pg_typeof 
-----------
 json
(1 row)