The core documentation on how to make requests says to use xxxNow to make request from a client, but those methods are deprecated, e.g., getNow.

Please make a tutorial and docs: how to create in-memory (off-heap) objects, how to allocate, how to serialize/deserialize (if need, i can't understand) this to byte array (located off-heap), how to change it fields.
For example now (in current system) I have class
User
{
long Id;
List[ItemA] ItemsA; // class ItemA { .. }
List[ItemB] ItemsB; // class ItemB { .. }
// and many more field
}

// and g

Add a response timeout value in the timeout message.

Most of the tests use assertions of the following form assert(predicate)(isTrue). While this is certainly a possible thing to do, we should consider utilizing the full power of zio-test.