Serial field won't updates automatically aftes saving in Postgres

[metakot]

piccolo==1.5.0
piccolo_admin==1.3.2
piccolo_api==1.4.0

So I have a table in Postgres:

class Example(Table):
    number = Serial()

Saving it

example = Example()
await example.save()
print(example.number)

it just prints

DEFAULT

refreshing it with await example.refresh() fills the field with value.
I think this is a low priority issue but confusing nonetheless.