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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 19 Jun 2018
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      Yet another JS WTF. JS uses 64-bit floats for numbers, but it *lies* when displaying them. 0x4000000000000000 is 4611686018427387904 and is *perfectly* represented as a float. But JS renders it as 4611686018427388000, because that has fewer significant digits in decimal?!pic.twitter.com/xbYbqMP9mY

      14 replies 76 retweets 213 likes
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    2. Joe Groff‏ @jckarter 19 Jun 2018
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      Replying to @marcan42

      Might be a side effect of using a modern floating point decimalization algorithm like Grisu3, which minimizes the number of significant digits necessary to uniquely represent the floating-point value

      1 reply 0 retweets 2 likes
      Hector Martin‏ @marcan42 19 Jun 2018
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      Replying to @jckarter

      Nah, they actually have an ad-hoc spec that is quite a mess: https://tc39.github.io/ecma262/#sec-tostring-applied-to-the-number-type … There's a Python module 'frepr' that uses the V8 JS engine impl and yet it *doesn't* do this, which makes me think the actual JS engine has horrible special cases to meet the crazy JS spec.

      10:42 AM - 19 Jun 2018
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      • John-Mark Gurney 🗑️🔥 Joe Groff
      1 reply 0 retweets 2 likes
        1. Hector Martin‏ @marcan42 19 Jun 2018
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          Replying to @marcan42 @jckarter

          Honestly, it's weird. V8 is supposed to use Grisu (also FF), which is supposed to be what became the double-conversion library, which frepr uses, and yet the crazy result in Chrome/FF is different from that (but matches the ECMAScript spec).

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