Fixes mapping for Traversable objects in IterableExtractor.

[gustavofreze]

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[Copilot]

Pull request overview

This PR fixes iterable mapping when an IterableMapper object is itself Traversable (e.g., implements IteratorAggregate), ensuring mapping uses the object’s iterator (and its keys) rather than reflecting and mapping an internal iterable property.

Changes:

• Update IterableExtractor to directly convert Traversable objects via iterator_to_array($object).
• Add test coverage for mapping a Traversable collection that yields keyed items.
• Introduce new test model fixtures (Invoice, Invoices, InvoiceSummaries) to reproduce and validate the keyed-iterator scenario.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Internal/Extractors/IterableExtractor.php	Ensures Traversable iterable mappers are extracted via iteration (preserving yielded keys).
tests/CollectionMappingTest.php	Adds a regression test asserting keys from a traversable iterator are preserved in mapped output.
tests/Models/Invoice.php	Test fixture representing an invoice element to be mapped.
tests/Models/Invoices.php	Test fixture iterable collection used by the traversable mapping test.
tests/Models/InvoiceSummaries.php	Test fixture implementing IteratorAggregate and yielding invoices keyed by invoice id.

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