[Issue 15885] New: float serialized to JSON loses precision

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15885

          Issue ID: 15885
           Summary: float serialized to JSON loses precision
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: rjmcguire at gmail.com

I've marked this issue as major because a lot of people are using JSON for
mobile app communication, and I discovered this because an incorrect invoice
was sent (fortunately only during testing).

In this code:
import std.json;
import std.stdio;

void main() {
    JSONValue json;
    json.type = JSON_TYPE.FLOAT;
    json.floating = 30738.22;
    writeln(toJSON(&json));
}

the resulting output is:
30738.2


The problem is that all float serialization just uses to!string() from
std.conv;
std.json should serialize to the standard @ json.org.

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