Re: [Json] 2-step proposal 4627bis + I-JSON
John Cowan <cowan@mercury.ccil.org> Thu, 04 July 2013 00:27 UTC
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Date: Wed, 03 Jul 2013 20:27:32 -0400
From: John Cowan <cowan@mercury.ccil.org>
To: Tim Bray <tbray@textuality.com>
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Subject: Re: [Json] 2-step proposal 4627bis + I-JSON
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Tim Bray scripsit: > 2. Recharter in a way that will allow us to produce something like a > strawman I cooked up, I-JSON: https://www.tbray.org/tmp/i-json.html > Produce something like that. Second victory! This is a fine trial balloon. I have two comments: 1) I do not understand the rationale of Section 2, which amounts to saying that the top-level datum SHOULD NOT be an array. The presence of the string "urn:ietf:i-json" as the first element of the array would serve the same purposes of self-identification, and an array (unlike an object) will be serialized in order by any conformant serializer. As for extensibility, it is obvious that an array can be extended by adding new elements to the end if the elements are semantically heterogeneous, and if they are homogeneous, there is nothing to extend. 2) Stating the precision of numbers does not suffice: you ought also to state explicitly that the valid range is numbers whose absolute value is between 2^-1074 and (1 + (1 - 2^52)) * 2^1023, inclusive. For example, the integer 4503599627370497 is not exactly representable as a double (it is 2^52+1) and ought not to be allowed in I-JSON. So I still prefer my proposal of "is exactly representable as an IEEE 754:2008 64-bit binary floating point number". -- A mosquito cried out in his pain, John Cowan "A chemist has poisoned my brain!" http://www.ccil.org/~cowan The cause of his sorrow cowan@ccil.org Was para-dichloro- Diphenyltrichloroethane. (aka DDT)
- [Json] 2-step proposal 4627bis + I-JSON Tim Bray
- Re: [Json] 2-step proposal 4627bis + I-JSON Mark Nottingham
- Re: [Json] 2-step proposal 4627bis + I-JSON Nico Williams
- Re: [Json] 2-step proposal 4627bis + I-JSON R S
- Re: [Json] 2-step proposal 4627bis + I-JSON John Cowan
- Re: [Json] 2-step proposal 4627bis + I-JSON Manger, James H
- Re: [Json] 2-step proposal 4627bis + I-JSON Martin J. Dürst
- Re: [Json] 2-step proposal 4627bis + I-JSON Tim Bray
- Re: [Json] 2-step proposal 4627bis + I-JSON John Cowan
- Re: [Json] 2-step proposal 4627bis + I-JSON John Cowan
- Re: [Json] 2-step proposal 4627bis + I-JSON Pete Cordell