GET
Syntax
        GET key
- Available since:
 - 1.0.0
 - Time complexity:
 - O(1)
 - ACL categories:
 - 
              
                
@read,@string,@fast, 
Get the value of key.
If the key does not exist the special value nil is returned.
An error is returned if the value stored at key is not a string, because GET
only handles string values.
Return
Bulk string reply: the value of key, or nil when key does not exist.
Examples
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