def batch.keys.first
import mylsm-lsm-store@0.6.0.1/src/ByteDurableDb.bend as ByteDurableDbimport Base
import mylsm-lsm-store@0.6.0.1/src/ByteMemTable.bend as ByteMemTable
import bend-kit-bytes@0.3.2.0/bytes.bend as Bytes
1587def batch.keys.first(pair: Bytes.Bytes & Bytes.Bytes) -> Bytes.Bytes & Bytes.Bytes & Bytes.Bytes:
1588 match pair:
1589 case (probe_key, retained):
1590 batch.keys.retained(probe_key, ByteMemTable.bytes.clone(retained))