Json, float parsing error

[Holub-Patrik]

Context

When loading a simple json file:

{
  "val": -10.0
}

Using a minimal program as such:

package main

import "core:encoding/json"
import "core:fmt"
import "core:os"

main :: proc() {
    data, ok := os.read_entire_file_from_filename("test.json")
    if !ok {
        fmt.println("Data read incorrectly.")
        return
    }
    defer delete(data)

    json_data, err := json.parse(data)
    if err != .None {
        fmt.println("Json couldn't be parsed")
        return
    }
    defer json.destroy_value(json_data)

    root := json_data.(json.Object)
    value := root["val"].(json.Float)

    fmt.println("Value read:", value)

    value_negative_10: f64 = 10.0 * (-1)
    fmt.println("Value real:", value_negative_10)
}

The output is:

Odin: dev-2024-09:962af780a
OS: Ubuntu 24-04-1 LTS, Linux 6.8.0-45-generic
CPU: AMD Ryzen 7 5800H with Radeon Graphics
RAM : 15388 MiB
Backend: LLVM18.1.8

Expected Behavior

Value read: -10
Value real -10

Current Behavior

Value read: -9.983125437429408
Value real: -10

Info

I do not know enough about the json parsing odin uses and so this could be expected behaviour. I have tested parsing the same json file in python (I know, not a fair comparison) and it correctly parsed this. If this is expected, I am sorry.