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Make `DataSource` implement `__len__` to standardize the data source contract (#1518)

Co-authored-by: Nan Jiang <59716405+nanjiangwill@users.noreply.github.com>
T
Tarun Sunkaraneni committed
fd13dcda2c587079c87ee37b64e980ed8959bc87
Parent: 5073e32
Committed by GitHub <noreply@github.com> on 2/3/2026, 9:24:30 AM