What is the bug or the crash?

See both doc for QgsLayoutExporter.exportToPdf(): https://qgis.org/pyqgis/master/core/QgsLayoutExporter.html#qgis.core.QgsLayoutExporter.exportToPdf

If no iterator is passed, the return value of QgsLayoutExporter.exportToPdf() is a member of QgsLayoutExporter.ExportResult and in case of error, error is not returned

but if an iterator is passed, the return value is a tuple (int / QgsLayoutExporter.ExportResult, str)

By consistency, it would be worth to return QgsLayoutExporter.ExportResult in both cases or a tuple but mixed type is confusing

Steps to reproduce the issue

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Versions

3.42.3 but doc of 3.42.3 and master is the same.

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response