putMany method
Appends one WAL object containing every put.
Implementation
Future<void> putMany(List<({Uint8List key, Bytes document})> entries) async {
if (entries.isEmpty) return;
final ops = <WalOp>[
for (final entry in entries)
WalOp.put(entry.key, entry.document.asUint8List()),
];
await _appendWal(ops);
}