[roxblnfk]

What was changed

• FallbackProcessor no longer recurses forever on objects with reference cycles. Before, an object with a property pointing to itself exhausted memory: the self-reference was removed from the result but still passed to the processor.
• FallbackProcessor keeps track of the objects it is exporting:
  • a property that points to the object itself or to an object that contains it (A → B → A) is left out, as the self-reference was meant to be;
  • an object reached again through an array or another processor is exported as ['@class' => …] only;
  • an object shared by several properties without a cycle is still exported in full in each place.
• No public API changes: FallbackProcessor only gains a parameterless constructor. README documents how cycles are handled.

Checklist

• Tested
  • Unit tests added; the previously skipped test passes
  • Testo, psalm, cs:diff and Infection (MSI 96%) run locally on PHP 8.4

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