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Increments the number stored at `field` in the hash stored at `key` by
`increment`.
If `key` does not exist, a new key holding a hash is created.
If `field` does not exist the value is set to `0` before the operation is
performed.
The range of values supported by `HINCRBY` is limited to 64 bit signed integers.
@return
@integer-reply: the value at `field` after the increment operation.
@examples
Since the `increment` argument is signed, both increment and decrement
operations can be performed:
```cli
HSET myhash field 5
HINCRBY myhash field 1
HINCRBY myhash field -1
HINCRBY myhash field -10
```
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