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Returns the bit value at _offset_ in the string value stored at _key_.
When _offset_ is beyond the string length, the string is assumed to be a
contiguous space with 0 bits.
When _key_ does not exist it is assumed to be an empty string, so _offset_ is
always out of range and the value is also assumed to be a contiguous space with
0 bits.
@return
@integer-reply: the bit value stored at _offset_.
@examples
```cli
SETBIT mykey 7 1
GETBIT mykey 0
GETBIT mykey 7
GETBIT mykey 100
```
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