Index arrays in config is not overrided correctly

[andser]

Hello!
Trying to use your lib, but faced a problem:

require 'vendor/autoload.php';

use PHLAK\Config\Config;

$array1 = [
	'assoc_key' => 'testvalue',
	'key' => [1,2,3,4],
];
$array2 = [
	'assoc_key' => 'override',
	'key' => ['somevalue'],
];

$config1 = new Config($array1);
$config2 = new Config($array2);
print_r($config1->merge($config2)->toArray());

It returns:

Array
(
    [assoc_key] => override
    [key] => Array
        (
            [0] => somevalue
            [1] => 2
            [2] => 3
            [3] => 4
        )

)

But should return:

Array
(
    [assoc_key] => override
    [key] => Array
        (
            [0] => somevalue
        )

)

[PHLAK]

This is the intended functionality however, I understand the confusion. The reason for this is due to the use of array_replace_recursive for merging the config arrays (see here). This is necessary to support merging of multi-dimensional arrays properly. For example:

$one = new Config([
    'database' => [
        'server' => '192.168.0.10',
        'port' => 3306
    ]
]);

$two = new Config([
    'database' => [
        'server' => '10.10.0.5'
    ]
]);
    
$one->merge($two);

Results in the following config array:

[
    'database' => [
        'server' => '10.10.0.5',
        'port' => 3306
    ]
]

This unfortunately breaks when the value of the top-level option is an array that is intended to be treated as an individual value. I don't currently have a work around for this but will keep this issue open to remind me to think about it and hopefully find a long-term solution.