Add valuePreservingFalsy method to handle falsy values in collections

[lokeshrangani]

Purpose

This PR adds a new valuePreservingFalsy method to Laravel Collections that safely retrieves a value for a given key without discarding falsy values like 0, false, '0', or an empty array.

Benefit to End Users

The existing value() method internally uses firstWhere(), which stops on the first truthy match—excluding valid falsy values such as 0 and false. This new method ensures that these legitimate values are preserved and returned when present.

Backward Compatibility

This is a new method, so it does not affect any existing functionality or break backward compatibility.
Tests Included

Example

$collection = collect([
    ['name' => 'Tim', 'balance' => 0],
    ['name' => 'John', 'balance' => 200],
]);

$collection->valuePreservingFalsy('balance'); // returns 0

Test coverage for all major PHP falsy values:

• 0 (int)
• 0.0 (float)
• '0' (string)
• false
• [] (empty array)
• null
• '' (empty string)

Related Issue

Closes #54910

[github-actions]

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