Why is tz-naive Timestamp converted to integer while tz-aware is kept as Timestamp?

Understandable and expected (tz-aware):

Why is tz-naive Timestamp converted to integer while tz-aware is kept as Timestamp?

Understandable and expected (tz-aware):

Why is tz-naive Timestamp converted to integer while tz-aware is kept as Timestamp?

Understandable and expected (tz-aware):