BaseObject String(value) 替换为 value.toString() 提高性能
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`String(value)` 即便是对象本身没有实现 `toString()` 方法的情况下，性能都要低几倍 可参考 https://tc39.es/ecma262/multipage/text-processing.html#sec-string-constructor 会在`toString()`之前做了多个检查 而 DragonBones 中所有class，都实现了 `toString()` 方法，性能更高 毕竟这是一个大量调用的方法
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String(value)即便是对象本身没有实现toString()方法的情况下，性能都要低几倍可参考 https://tc39.es/ecma262/multipage/text-processing.html#sec-string-constructor
会在
toString()之前做了多个检查而 DragonBones 中所有class，都实现了
toString()方法，性能更高毕竟这是一个大量调用的方法