std.data.json formal review

[Marco Leise via Digitalmars-d]

Am Tue, 28 Jul 2015 14:07:18 +0000
schrieb "Atila Neves" <atila.neves at gmail.com>:

> Start of the two week process, folks.
> 
> Code: https://github.com/s-ludwig/std_data_json
> Docs: http://s-ludwig.github.io/std_data_json/
> 
> Atila

There is one thing I noticed today that I personally feel
strongly about: Serialized double values are not restored
accurately. That is, when I send a double value via JSON and
use enough digits to represent it accurately, it may not be
decoded to the same value. `std.json` does not have this
problem with the random values from [0..1) I tested with.
I also tried `LexOptions.useBigInt/.useLong` to no avail.

Looking at the unittests it seems the decision was deliberate,
as `approxEqual` is used in parsing tests. JSON specs don't
enforce any specific accuracy, but they say that you can
arrange for a lossless transmission of the widely supported
IEEE double values, by using up to 17 significant digits.

-- 
Marco