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Prohibit reading beyond DS1LSTAR, and enforce management of DS1LSTAR so it is never allowed to point past uninitialized space.
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What about datasets that have no EOF mark and depend rather on end-of-extent? Like JES2 SPOOL space? RACF DB? Some forms of BDAM datasets? The name of the game here is FLEXIBILITY; unfortunately, that sometimes leads to COMPLEXITY.

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