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Decrements the number stored at `key` by `decrement`. 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 decrement
@examples
```cli
SET mykey "10"
DECRBY mykey 3
```
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