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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 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.

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    5. Hector Martin‏ @marcan42 20 Jun 2018
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      My point is that floats *are* Proper Integers: up to 53 bits they can represent every possible integer, and beyond that they can represent certain integers (but those integers, they represent exactly). JS is printing a *different* integer than what the float represents.

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    6. Hector Martin‏ @marcan42 20 Jun 2018
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      Replying to @marcan42 @robertbak

      Sure, it's repeatable, and it round-trips, but it's just /wrong/. If the float has a given value, and you print a *different* value, as an integer (not a decimal number that is obviously rounded), that's just messed up. Sure, you can *define* it that way, but still.

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    7. Hector Martin‏ @marcan42 20 Jun 2018
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      Replying to @marcan42 @robertbak

      Heck, even recent discussion and change to the BigInt spec agree: large Numbers are well-defined as integers. It's ridiculous that converting a Number to a BigInt (which is a safe operation) will change the number that is returned by toString.https://github.com/tc39/proposal-bigint/pull/138 …

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    9. Hector Martin‏ @marcan42 20 Jun 2018
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      You deleted a tweet about 4611686018427388000 converting to the same number as BigInt. I can't test it because Chrome is using an older version of the draft that forbids that, but nope. Converting what JS calls 4611686018427388000 to BigInt would yield 4611686018427387904n.

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      Hector Martin‏ @marcan42 20 Jun 2018
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      Yes, I linked to that algorithm before in other threads. That algorithm is the problem, and it's stupid and nonsensical. The threshold to break out into e-notation (step 9) should be earlier, instead of padding with trailing zeroes (step 6). No other language does this.

      3:47 AM - 20 Jun 2018
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        1. Hector Martin‏ @marcan42 20 Jun 2018
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          Replying to @marcan42 @robertbak

          This would all be much easier if people accepted the fact that the only reason it hasn't been changed is because of backwards compatibility, instead of arguing endlessly for the status quo. Some things are just stupid. Yes, we're stuck with them. That doesn't make them not stupid

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        2. Hector Martin‏ @marcan42 20 Jun 2018
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          But Python doesn't do either of those when converting to a string, it uses 1.000000000000001e+18. That's *both* natural *and* makes the loss of precision clear. A number without a decimal point is *not* obviously not actually a precise integer to non-tech people.

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