| Returns whether a given key should be returned via the cursor.
This method should not assume that the given key is for a committed
record or not, nor should it assume that the key will be returned via
the cursor if this method returns true. The record for this key will
not be locked until this method returns. If, when the record is locked,
the record is found to be uncommitted or deleted, the key will not be
returned via the cursor.
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