相比之下，三個月前何衛東落馬時為「五宗罪」，且措辭和定性都要比張又俠弱得多。
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Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.
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fills up, so we can eventually append most new tasks to the slice