Is this a bug or am I holding it wrong? https://gitlab.com/meltano/singer-sdk/-/blob/main/singer_sdk/streams/core.py#L107

state

here should look like:

{
  "replication_key": "some_column",
  "replication_key_value": "2021-04-01T00:00:00Z"
}

Which basically means that that

if

statement can never succeed unless your replication key is

replication_key

or

replication_key_value