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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
      • Report Tweet
      • Report NetzDG Violation

      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. Hector Martin‏ @marcan42 19 Jun 2018
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      Here's Python doing the *sane* thing. If you're going to round down to fewest significant digits, *use float notation*. If you're going to convert/display as integer, *give me the real number*. JS instead chooses to make up incorrect digits and pretend they're significant.pic.twitter.com/H4os79NC0D

      3 replies 5 retweets 41 likes
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    3. Hector Martin‏ @marcan42 19 Jun 2018
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      Here's the IEEE 754 spec explicitly saying conversions to integer must use the exact integer when the value is representable in both formats. JS is violating the IEEE 754 standard. Please don't make excuses about different representations for the same float. This is *broken*.pic.twitter.com/pUEdUCxGEd

      3 replies 16 retweets 50 likes
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    5. Hector Martin‏ @marcan42 20 Jun 2018
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      This is about string representation; I've explained this in other threads. JS has one number format, but it *pretends* to make the distinction when converting to string, by notating floats with exact integer values differently (without a decimal point, unlike other languages).

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 20 Jun 2018
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      Replying to @marcan42 @robertbak

      Which is all fine and everything, until it starts spitting out decimal representations of integer values that aren't the actual integer value represented by a given float.

      2:22 AM - 20 Jun 2018
      0 replies 0 retweets 0 likes
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