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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. Allen Wirfs-Brock‏ @awbjs 15 May 2019
      • Report Tweet
      • Report NetzDG Violation

      Allen Wirfs-Brock Retweeted Benedikt Meurer

      Give the man a prize. It looks like a specification bug! The a[0]=4 eventually leads to an assertion within the specification that fails. That means spec. bug. https://tc39.github.io/ecma262/#sec-integer-indexed-exotic-objects-set-p-v-receiver … Should fall through to OrdinarySet if p!==receiverhttps://twitter.com/bmeurer/status/1128674484217679873 …

      Allen Wirfs-Brock added,

      Benedikt Meurer @bmeurer
      Enjoy figuring out the correct semantics of this little goody: 😀 ``` Object.setPrototypeOf(Array.prototype, new Int8Array(0)); const a = []; a[0] = 4; console.log(+a[0]); ``` Spoiler: browsers disagree on what's correct here. 🙈 https://twitter.com/pixari/status/1128602125754359808 …
      2 replies 5 retweets 41 likes
    2. Benedikt Meurer‏ @bmeurer 15 May 2019
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      Replying to @awbjs

      Which assertion are you talking about? I probably missed it, but my impression was that it's intentional that the typedarray happily swallows the store?

      1 reply 0 retweets 0 likes
    3. Allen Wirfs-Brock‏ @awbjs 15 May 2019
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      Replying to @bmeurer

      Step 2 https://tc39.github.io/ecma262/#sec-integerindexedelementget …

      1 reply 0 retweets 1 like
    4. Allen Wirfs-Brock‏ @awbjs 15 May 2019
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      Replying to @awbjs @bmeurer

      Or, not but it should have if reciever instead of o was passed. [[Set]] should not be trying to mutate a prototype. Consider if length of prototype had been 1

      1 reply 0 retweets 2 likes
    5. Benedikt Meurer‏ @bmeurer 15 May 2019
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      Replying to @awbjs

      O in this case is the prototype. It's odd that it'd try to mutate the prototype, indeed. I don't think it's a bug in the spec, but just a weird consequence of the way [[Set]] is defined. I like your suggestion to do OrdinarySet if O!=Receiver

      1 reply 0 retweets 0 likes
    6. Allen Wirfs-Brock‏ @awbjs 15 May 2019
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      Replying to @bmeurer

      see https://github.com/tc39/ecma262/issues/1541 … It is a bug in the spec. I wrote [[Set]] spec for typed arrays and this behavior is not what I intended. [[Set]] should not be mutating prototypes. A user could write a Proxy that did that, but its behavior not be inconsistent w/ normal expectation

      1 reply 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias 15 May 2019
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      Replying to @awbjs @bmeurer

      For those following along, Allen has now filed the issue here:https://github.com/tc39/ecma262/issues/1541 …

      5:01 PM - 15 May 2019
      • 2 Likes
      • Oto Dočkal Jarrod Overson
      0 replies 0 retweets 2 likes

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