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fix issues 2591 https://github.com/redis/redis-doc/issues/2591 #2592

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fix issues 2591 https://github.com/redis/redis-doc/issues/2591 #2592

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9 changes: 4 additions & 5 deletions commands/decrby.md
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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.
The `DECRBY` command reduces the value stored at the specified `key` by the specified `decrement`.
If the key does not exist, it is initialized with a value of `0` before performing the operation.
If the key's value is not of the correct type or cannot be represented as an integer, an error is returned.
This operation is limited to **64-bit** signed integers.

See `INCR` for extra information on increment/decrement operations.

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