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Read-only variant of the `BITFIELD` command.
It is like the original `BITFIELD` but only accepts `!GET` subcommand and can safely be used in read-only replicas.
Since the original `BITFIELD` has `!SET` and `!INCRBY` options it is technically flagged as a writing command in the Redis command table.
For this reason read-only replicas in a Redis Cluster will redirect it to the master instance even if the connection is in read-only mode (see the `READONLY` command of Redis Cluster).
Since Redis 6.2, the `BITFIELD_RO` variant was introduced in order to allow `BITFIELD` behavior in read-only replicas without breaking compatibility on command flags.
See original `BITFIELD` for more details.
@examples
```
BITFIELD_RO hello GET i8 16
```
@return
@array-reply: An array with each entry being the corresponding result of the subcommand given at the same position.
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