[6.x] Correct recursive form data merging

[mikemartin]

Replaces mergeRecursive() with replaceRecursive() when combining initial form data and extra data. This prevents scalar values from being merged into arrays (for example [null, 'apple']) while still preserving nested form structures.

Using mergeRecursive():

$initialFormData = [
    'fruit' => null
    'quantity' => 1,
];

$extraData = [
    'fruit' => 'apple',
    'quantity' => 2,
];

return [
  'x-data' => $this->renderAlpineXData(collect($initialFormData())->mergeRecursive($extraData)->all(), $this->scope),
];

// [
//     'fruit' => [null, 'apple'],
//     'quantity' => [1, 2],
// ]

Using replaceRecursive():

$initialFormData = [
    'fruit' => null
    'quantity' => 1,
];

$extraData = [
    'fruit' => 'apple',
    'quantity' => 2,
];

return [
  'x-data' => $this->renderAlpineXData(collect($initialFormData())->replaceRecursive($extraData)->all(), $this->scope),
];

// [
//     'fruit' => ['apple'],
//     'quantity' => [2],
// ]

[duncanmcclean]

Are you able to resolve the merge conflicts?

[mikemartin]

@duncanmcclean Should be fixed.