Indexsan To H Shimakuri Rj01307155 Upd Extra Quality [2021] -

That means "update." If you look at the revision history for the question you linked to you can see what was added. Meta Stack Exchange

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The phrase "extra quality" suggests that this update not only brings the standard improvements but also an enhanced level of performance, reliability, or user experience. In software development, achieving "extra quality" means ensuring that the product exceeds the baseline expectations of users and possibly incorporates advanced features or optimizations. That means "update

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