Working with custom types

[TmLev]

Let's say I have a custom type:

CREATE TYPE twitter_tweet AS (
  url VARCHAR(4096),

  text       TEXT,
  image_urls VARCHAR(4096)[]
);

And a table storing array of said custom type as a column:

CREATE TABLE twitter_threads AS (
  tweets twitter_tweet[] NOT NULL DEFAULT '{}::twitter_tweet[]'
)

How can I insert or select an array of twitter_tweet-s?

I've tried different combinations of sql.array / sql.join / etc, but none of them seem to work. Currently the only option I see is to build a raw SQL and insert it as-is, which is quite dangerous and clunky.