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Perl 5.20.1 发布了，如果你从 5.18.0 升级，请先阅读 perl5200delta, 因为这里描述了 5.18 和 5.20 之间的区别。该版本与 5.20.0 版本没有什么不兼容的改变，如果有的话，那一定是 bug。
性能方面的提升：
An optimization to avoid problems with COW and deliberately overallocated PVs has been disabled because it interfered with another, more important, optimization, causing a slowdown on some platforms. [perl #121975]
Returning a string from a lexical variable could be slow in some cases. This has now been fixed. [perl #121977]
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