Steps to replicate the issue (include links if applicable):

• Define a "config" variable Foo with an integer value in extension.js
• Reference that variable as $wgFoo, expecting it to be an integer
• But $wgFoo is an array

Example extension.json file:

{
    "name": "FooExtension",
    "version": "2.0.0",
    "author": [
        "Me"
    ],
    "description": "Do something",
    "license-name": "GPL-2.0-or-later",
    "type": "other",
    "AutoloadClasses": {
        "FooExtension": "includes/FooExtensionHooks.php"
    },
    "config": {
        "FooExtensionTimeoutSeconds": {
            "value": 10,
            "description": "Set the timeout in seconds"
        },
        "FooExtensionAnother": {
            "value": true,
            "description": "Something else"
        }
    },
    "Hooks": {
        "BeforeInitialize": "FooExtension::onBeforeInitialize",
        "EditPage::showEditForm:initial": "FooExtension::onEditPageShowEditFormInitial",
        "MultiContentSave": "FooExtension::onMultiContentSave"
    },
    "manifest_version": 1
}

What happens?:

When I refer to $wgFoo numerically in a hook function, like if (20 > $wgFoo), the comparison returns 0 even though $wgFoo is 10. On examination with gettype(), the variable $wgFoo is an array. I have to refer to the value as $wgFoo['value'] instead. The same comparison worked in MediaWiki 1.37. I just upgraded to 1.39 and upgraded PHP from 7.4 to 8.1, and this new behavior began.

What should have happened instead?:

$wgFoo is an integer.

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):