change_column with {null: false} executes SQL "DROP NOT NULL"

[briskt]

Attempting to change a PostgreSQL column from NULL to NOT NULL. Added the following fizz command to a new migration:

change_column("posts", "destination_id", "integer", {null: false})

Running pop migrate -d produces:

sql - ALTER TABLE "posts" ALTER COLUMN "destination_id" TYPE integer, ALTER COLUMN "destination_id" DROP NOT NULL;```

instead of:

sql - ALTER TABLE "posts" ALTER COLUMN "destination_id" TYPE integer, ALTER COLUMN "destination_id" SET NOT NULL;

Workaround (empty options) is easy, but it seems this should work too.

[briskt]

A colleague of mine hit this yesterday, except on a new column. He did:

add_column("posts", "kilograms", "numeric(13,4)", {null: false})

expecting that it would make a non-nullable column.