Gets the yield of the tree. The Label of all leaf nodes is returned as a list ordered by the natural left to right order of the leaves. Null values, if any, are inserted into the list like any other value.
@return a List of the data in the tree's leaves.
Yield this thread with arguments
@param args The arguments to send as return values to {@link #resume(Varargs)}
@return {@link Varargs} provided as arguments to {@link #resume(Varargs)}
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