not null domain column shown as nullable in graphql schema about graphile-engine HOT 2 CLOSED

[mathroc] # select * from pg_type where typname = 'not_null_url';
-[ RECORD 1 ]--+-------------
typname        | not_null_url
typnamespace   | 7828650
typowner       | 10
typlen         | -1
typbyval       | f
typtype        | d
typcategory    | S
typispreferred | f
typisdefined   | t
typdelim       | ,
typrelid       | 0
typelem        | 0
typarray       | 0
typinput       | domain_in
typoutput      | varcharout
typreceive     | domain_recv
typsend        | varcharsend
typmodin       | -
typmodout      | -
typanalyze     | -
typalign       | i
typstorage     | x
typnotnull     | t
typbasetype    | 7828651
typtypmod      | -1
typndims       | 0
typcollation   | 100
typdefaultbin  | ¤
typdefault     | ¤
typacl         | ¤

Time: 12.673 ms
[mathroc] # select oid from pg_class where relname = 'page';
   oid
---------
 7828654
(1 row)

Time: 0.634 ms
[mathroc] # select * from pg_attribute where attrelid = 7828654;
 attrelid |    attname    | atttypid | attstattarget | attlen | attnum | attndims | attcacheoff | atttypmod | attbyval | attstorage | attalign | attnotnull | atthasdef | attisdropped | attislocal | attinhcount | attcollation | attacl | attoptions | attfdwoptions
----------+---------------+----------+---------------+--------+--------+----------+-------------+-----------+----------+------------+----------+------------+-----------+--------------+------------+-------------+--------------+--------+------------+---------------
  7828654 | url           |  7828652 |            -1 |     -1 |      1 |        0 |          -1 |        -1 | f        | x          | i        | f          | f         | f            | t          |           0 |          100 | ¤      | ¤          | ¤
  7828654 | canonical_url |  7828651 |            -1 |     -1 |      2 |        0 |          -1 |        -1 | f        | x          | i        | f          | f         | f            | t          |           0 |          100 | ¤      | ¤          | ¤
  7828654 | keywords      |  7828653 |            -1 |     -1 |      3 |        0 |          -1 |        -1 | f        | x          | i        | f          | f         | f            | t          |           0 |          100 | ¤      | ¤          | ¤
(3 rows)

Time: 2.508 ms