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The request for a "long piece for Hutool 3.9 UPD" likely refers to the legacy v3.x series
The .UPD suffix became a mythical label in open-source circles—a symbol of a release uncorrupted by roadmap pressure, existing only to serve the code that already was. Hutool 3.9 UPD
The team behind Hutool replaced several recursive algorithms with iterative versions and introduced for reflection results, drastically reducing GC pressure. The request for a "long piece for Hutool 3
// 4. Reflection - Deep copy with ignore User user = new User("John"); User copy = BeanUtil.copyProperties(user, User.class, "id"); Enhanced Data Processing Capabilities : Hutool 3
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