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Increments the number stored at `key` by `increment`.
If the key does not exist, it is set to `0` before performing the operation.
An error is returned if the key contains a value of the wrong type or contains a
string that can not be represented as integer.
This operation is limited to 64 bit signed integers.
See `INCR` for extra information on increment/decrement operations.
@return
@integer-reply: the value of `key` after the increment
@examples
```cli
SET mykey "10"
INCRBY mykey 5
```
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