Output of Float Numbers - Rounding Not Enforced

[npruzaniec]

Description

I am using element-api to output JSON from Craft number fields (which are themselves limited to 1 or 2 decimal places) but for some reason, on output these are extended to 15 decimal places regardless of any PHP rounding rules I use in my controller classes.

Steps to reproduce

1. Output number field in an API endpoint.
2. View that output in the browser.

Additional info

• Craft version: Craft Pro 4.5.6.1
• PHP version: 8.0.28
• Database driver & version: MariaDB 10.4.28
• Plugins & versions:
  

Code:

return [
  'imperial' => [
    'value' => round($imperial, 2),
    'units' => $units->unit_label->imperial,
  ],
  'metric' => [
    'value' =>  round($metric, 2),
    'units' => $units->unit_label->metric,
  ]
];

Output:

"imperial": {
  "value": 10.800000000000001,
  "units": "in"
},
 "metric": {
  "value": 273,
  "units": "mm"
}

[npruzaniec]

I should add, the output is the same with or without the round() function.

[npruzaniec]

I found a server configuration that solved this for me after I discovered the issue did not exist when deployed to our staging server.

I am running this locally via DDEV. Adding a php.ini file to /craft/.ddev/php/php.ini with the following contents resolved the float precision issue for me:

[PHP]
serialize_precision = -1