tc39/ecma262

Index conversion in ArrayAccumulation

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#1,095 创建于 2018年2月9日

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good first issueneeds consensusneeds test262 testsnormative change

描述

ArrayAccumulation computes the array index via ToString(ToUint32(nextIndex+padding)). This means the index may become 2^32-1. But that's not a valid array index anymore since it is the max value of the length property.

贡献者指南

技术栈
javascript
领域
documentation
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
4
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
ECMAScript spec understandingarray index semantics
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
20
研究方向
The issue concerns the ArrayAccumulation algorithm in the ECMAScript specification. To investigate, read the algorithm at the linked section, understand how index conversion using ToUint32 and ToString works, and verify whether the resulting index can be 2^32-1 (which is not a valid array index). Then propose a fix, such as capping the index or adjusting the algorithm to handle edge cases. Refer to the spec text and any related discussions in the issue comments.
Index conversion in ArrayAccumulation · tc39/ecma262#1095 | Good First Issue