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qntm's profile
quarantine 'em
quarantine 'em
quarantine 'em
@qntm

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quarantine 'em

@qntm

I created the Antimemetics Division. http://scp-wiki.wikidot.com/antimemetics-division-hub …

qntm.org
Joined September 2009

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    1. quarantine 'em‏ @qntm 6 Feb 2019
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      Halppic.twitter.com/YiAxGirqOt

      9 replies 29 retweets 118 likes
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    2. quarantine 'em‏ @qntm 6 Feb 2019
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      Weirdly, the value returned by `143 ** 143` - i.e. the new, experimental exponentiation operator - is closer to the precise result than that returned from ancient stalwart `Math.pow`pic.twitter.com/YuWf3TJC6N

      6 replies 1 retweet 27 likes
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    3. quarantine 'em‏ @qntm 8 Feb 2019
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      OK so I think what's happening is that when V8 interprets an exponentiation expression dynamically (e.g. `x ** x`) it drops through to `Math.pow`, but when it sees a constant exponentiation expression (e.g. `99 ** 99`) it computes the result inline using a different routine?pic.twitter.com/akoTkZi4Ag

      2 replies 1 retweet 33 likes
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    4. quarantine 'em‏ @qntm 8 Feb 2019
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      The inline routine has the advantage of returning the correct answer, whereas `Math.pow` evidently has some kind of bug

      1 reply 0 retweets 12 likes
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    5. quarantine 'em‏ @qntm 8 Feb 2019
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      Furthermore, the inline routine seems to be in use for integers only, so it's not possible to simply retire `Math.pow`'s current (faulty) implementation and use the inline exponentiation dealie insteadpic.twitter.com/HCQuj6Ex5B

      1 reply 0 retweets 11 likes
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    6. quarantine 'em‏ @qntm 8 Feb 2019
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      I imagine the separate integer exponentiation routine was hand-written for performance gains over calling `Math.pow` in certain scenarios

      2 replies 0 retweets 9 likes
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    7. quarantine 'em‏ @qntm 8 Feb 2019
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      Try this, kids at home! (V8 only AFAIK so Chrome or Node.js)pic.twitter.com/cFB2pWFRlA

      5 replies 28 retweets 82 likes
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      quarantine 'em‏ @qntm 8 Feb 2019
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      For serious though where/how do I raise this

      6:42 PM - 8 Feb 2019
      • 8 Likes
      • Michał K. Feiler ❁ hb nwyn Omer Katz / عُمِر كاتس squish Christopher Watford Marcus Medom Ryding
      4 replies 0 retweets 8 likes
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        1. quarantine 'em‏ @qntm 9 Feb 2019
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          For future reference I'm seeing this in 64-bit Chrome 72.0.3626.96 on Windows, and in Node.js 10.15.1 which uses V8 6.8.275.32-node.12

          1 reply 0 retweets 3 likes
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        2. quarantine 'em‏ @qntm 9 Feb 2019
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          quarantine 'em Retweeted Mathias Bynens

          Reportedly a long-known issue with a fix on its way down the pipelinehttps://twitter.com/mathias/status/1094209241311838210 …

          quarantine 'em added,

          Mathias BynensVerified account @mathias
          Replying to @DasSurma @qntm @bmeurer
          Simpler repro: const x = 99; console.log(x ** x - 99 ** 99); It’s fixed in @v8js master. See https://bugs.chromium.org/p/v8/issues/detail?id=5848 ….
          2 replies 2 retweets 8 likes
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        3. quarantine 'em‏ @qntm 13 Jun 2019
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          This appears to be fixed in Chrome 74.0.3729.169.pic.twitter.com/oQXwnoX9Tb

          0 replies 2 retweets 6 likes
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          4. End of conversation
        2. New conversation
        1.  💖 Taudry Hepburn  💖‏ @tabatkins 8 Feb 2019
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          Replying to @qntm

          I can pass it along

          1 reply 0 retweets 0 likes
        2. quarantine 'em‏ @qntm 8 Feb 2019
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          Replying to @tabatkins

          I would appreciate that, thank you, it would save me registering an account and figuring out protocol and suchlike. Do share the link if possible

          1 reply 0 retweets 1 like
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        1. Jesin 🌹 of Antifa‏ @Jesin00 8 Feb 2019
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          I think this behavior is actually standards-compliant.

          0 replies 0 retweets 0 likes
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        1. Andrew Paprocki‏ @apaprocki 8 Feb 2019
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          Replying to @qntm

          Timely.. seems the fix for this landed (again) yesterday:https://github.com/v8/v8/commit/98453126c109016c9d32c6ebd89dd83f69dd8efb …

          0 replies 0 retweets 0 likes
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