Postgres CDC does not provide old values even though REPLICA IDENTITY is set to FULL

Our team is looking into getting CDC data from Postgres via AirByte. We notice here:[…]airbyte/integrations/debezium/internals/, that in case of UPDATE operations, AirByte strips out the old values even if they are received from Debezium (assuming REPLICA IDENTITY is set to FULL ). I am curious why we do that. We are happy to contribute a patch that inserts the old values into a new field (let’s say _ab_cdc_before ) in the payload, but would that be welcomed? If not, I’m curious to understand the rationale.