looks ahead cnt without changing the internal data "pointers" of the data source (this is mostly needed by LazyStreams, because they do not know by definition their boundaries)
either the element or ITERATION_STATUS.EO_STRM if we hit the end of the stream before finding the "cnt" element
the elements to look ahead
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an intermediate data source which prefilters incoming stream data and lets only the data out which passes the filter function check