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| <div class="block">Verify the delicate, fragile logic for setting the value count and |
| filling empty values. Some operators and readers first write values, |
| then set the value count at the end of the batch. The "complex writers" |
| set the value count after each value. The "lastSet" count tracks the |
| last value actually written, but is set in fillEmpties(), which is |
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