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Get the value of `key` and delete the key. This command is similar to `GET`,
except for the fact that it also deletes the key on success (if and only if the
key's value type is a string).

@return

@bulk-string-reply: the value of `key`, `nil` when `key` does not exist, or an
error if the key's value type isn't a string.

@examples

```cli
SET mykey "Hello"
GETDEL mykey
GET mykey
```