code: func (b *bucket) Get(key []byte) []byte {
  	// Ensure transaction state is valid.
  	if err := b.tx.checkClosed(); err != nil {
  		return nil
  	}
  
  	// Nothing to return if there is no key.
  	if len(key) == 0 {
  		return nil
  	}
  
  	return b.tx.fetchKey(bucketizedKey(b.id, key))
  }
docs: // Get returns the value for the given key.  Returns nil if the key does not
  // exist in this bucket.  An empty slice is returned for keys that exist but
  // have no value assigned.
  //
  // NOTE: The value returned by this function is only valid during a transaction.
  // Attempting to access it after a transaction has ended results in undefined
  // behavior.  Additionally, the value must NOT be modified by the caller.
  //
  // This function is part of the database.Bucket interface implementation.