Allow multidimensional array as another return value option for WireArray::each(), WireArray::explode()

[wirecodex]

Current implementation always return an array of key/value. The following code:

$companies = $pages->find("template=company, parent=/companies/, limit=10")->explode([
    "title",
    "contact.person",
    "contact.email",
    "address.city", 
    "address.state",
    "address.zip"
    ]);

will return this array for each item:

0 => [
    'title' => 'ProcessWire, Inc.'
    'contact.person' => 'John Doe'
    'contact.email' => 'johndoe@domain.com'
    'address.city' => 'Melbourne Beach'
    'address.state' => 'FL'
    'address.zip' => '32951'
]

otherwise if I use the following:

$companies = $pages->find("template=company, parent=/companies/, limit=10")->explode([
    "title",
    "contact[]",
    "address[]"
    ]);

I will get the whole WireArray for contact and address field like:

0 => [
    'title' => 'ProcessWire, Inc.'
    'contact[]' => WireArray
    'address[]' => WireArray
]

The feature that I propose is to allow this:

$companies = $pages->find("template=company, parent=/companies/, limit=10")->explode([
    "title",
    "contact[person, email]",
    "address[city, state, zip]"
    ]);

with a return array like:

0 => [
    'title' => 'ProcessWire, Inc.'
    'contact' => [
        'person' => 'John Doe',
        'email' => 'jhondoe@gmail.com'
    ],
    'address' => [
        'city' => 'Melbourne Beach',
        'state' => 'FL',
        'zip' => '32951'
    ]
]