tc39/ecma262

Index conversion in ArrayAccumulation

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#1,095 opened on Feb 9, 2018

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good first issueneeds consensusneeds test262 testsnormative change

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Description

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.

Contributor guide

Research direction
Examine the ArrayAccumulation algorithm in the ECMAScript specification and verify whether `ToString(ToUint32(nextIndex+padding))` can produce an index value of 2^32-1, which is not a valid array index. Propose a fix to ensure the index is within valid range.
Tech stack
javascript
Domain
documentation
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
None
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30