Serialize the value stored at key in a Redis-specific format and return it to the user. The returned value can be synthesized back into a Redis key using the RESTORE command.
The serialization format is opaque and non-standard, however it has a few semantic characteristics:
The serialized value does NOT contain expire information. In order to capture the time to live of the current value the PTTL command should be used.
key does not exist a nil bulk reply is returned.
Bulk string reply: the serialized value.
"OK"redis> DUMP mykey
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