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              patch #2 applies cleanly and installed this on Drupal 9 instance.
Ran drupal-check and found no issues:
drupal-check -ad modules/contrib/form_placeholder                                       
PHPStan crashed in the previous run probably because of excessive memory consumption.
It consumed around 24 MB of memory.
To avoid this issue, allow to use more memory with the --memory-limit option.
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              0