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Sets `field` in the hash stored at `key` to `value`, only if `field` does not
yet exist. If `key` does not exist, a new key holding a hash is created. If
`field` already exists, this operation has no effect.
@return
@integer-reply, specifically:
- `1` if `field` is a new field in the hash and `value` was set.
- `0` if `field` already exists in the hash and no operation was performed.
@examples
```cli
HSETNX myhash field "Hello"
HSETNX myhash field "World"
HGET myhash field
```
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