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docs.rs: building fewer targets by default
docs.rs 默认构建目标从五个减为一个，2026年5月起生效，节省资源并加速构建，多目标 crate 需手动配置。
Building fewer targets by default On 2026-05-01 , docs.rs will make a breaking change to its build behavior. Today, if a crate does not define a targe…