General code health improvements

[xHeaven]

No description provided.

[xHeaven]

How do we feel about being very explicit with if conditions? We could merge things like this into a single if statement instead of branching out a bunch of them:

if (!is_object($value)) {
    return true;
}

if ($property->type->kind->isDataCollectable()) {
    return true; // Transform everything to data objects
}

// ---

$class = new ReflectionClass($className);

if (empty($class->getDocComment())) {
    return self::$cache[$className] = null;
}

if (! $this->isIterable($class)) {
    return self::$cache[$className] = null;
}

$type = $this->getCollectionReturnType($class);

if ($type === null || $type['valueType'] === null) {
    return self::$cache[$className] = null;
}

// ---

if ($property->type->isNullable || $property->type->isOptional) {
    return false;
}

if ($property->type->kind->isDataCollectable() && $rules->hasType(Present::class)) {
    return false;
}

if ($rules->hasType(BooleanType::class)) {
    return false;
}

if ($rules->hasType(Nullable::class)) {
    return false;
}

if ($rules->hasType(RequiringRule::class)) {
    return false;
}

[xHeaven]

I'm not entirely sure about b32a68d (#920), is this the intended behavior?
I've tested it. Take this code:

new \Spatie\LaravelData\Support\Validation\ValidationRuleFactory()->create("accepted_if:test,false")->__toString();

Original parser output:

"accepted_if:test,1" // incorrect

Modified parser output:

"accepted_if:test,false" // correct

[xHeaven]

For the failed test, I can either do this:

$collection = array_map(
    fn ($value) => $this->transformationClosure($nestedContext)($value),
    is_array($items) ? $items : $items->all()
);

Or I can revert the entire change to a foreach loop. Which one is preferred?

Edit: I went with my proposal.