Future IO Helper methods.
A set of remote iterators supporting transformation and filtering, with IOStatisticsSource passthrough, and of conversions of the iterators to lists/arrays and of performing actions on the values.
RemoteIteratorsiterators go beyond that of the java ones, in terms of declaring themselves Closeable and implementors of
IOStatisticsSource; a chain of wrapped iterators can supply statistics of the inner iterators, and encourage close() to be called after use.
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