shift()
  
	Instance Public methods
	Removes a [key, value] pair from the database, and returns it. If the
database is empty, returns nil.
The order in which values are removed/returned is not guaranteed.
Removes a [key, value] pair from the database, and returns it. If the
database is empty, returns nil.
The order in which values are removed/returned is not guaranteed.
 
          
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