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Fix unsound Array.concat() typings - #33620

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Jack Bates (jablko) wants to merge 2 commits into
microsoft:masterfrom
jablko:patch-11
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Fix unsound Array.concat() typings#33620
Jack Bates (jablko) wants to merge 2 commits into
microsoft:masterfrom
jablko:patch-11

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@jablko

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Fixes #19535

@RyanCavanaugh

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Jack Bates (@jablko) we can't merge all these PRs independently - please make a roll-up PR with all the concat changes in one so we can actually test them. There should also be a unified test suite that clearly outlines the behaviors you want to change.

@jablko

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Ryan Cavanaugh (@RyanCavanaugh) Sure thing: I've now created #33645 combining all of the Array.concat() changes

@RyanCavanaugh

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Rolled into #33645

@microsoft Microsoft (microsoft) locked as resolved and limited conversation to collaborators Oct 21, 2025
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Soundness issue with Array.prototype.concat and arrays of arrays

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