Bulletin · department
Silence
What is not there, treated as a finding rather than a gap. The hardest defect to see, because nothing about a missing record is malformed.
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We did not know where the weekend is
A country page drew a Saturday–Sunday weekend for Saudi Arabia — on the page a reader visits to learn that Saudi Arabia rests on Friday and Saturday. The assumption was not in that chart. It was underneath everything.
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You cannot search for what you did not think of
A dataset assembled from the open web inherits the shape of that web without anyone choosing it. No validator catches the result, because nothing is malformed — the record is consistent, correctly sourced, and missing most of the festival.