PHP memory limit of '-1' not accepted.
I am running CiviCRM 5.32.2 and Drupal 8.9.11.
My hosting service defaults the PHP memory_limit parameter to '-1', meaning 'unlimited'. The Drupal System Status Report flags a warning that this is insufficient, as follows, which presumably originates from CiviCRM.
CIVICRM: SYSTEM: YOU HAVE -1M ALLOCATED (MINIMUM 32MB, RECOMMENDED 64MB)
CiviCRM: System: You have -1M allocated (minimum 32Mb, recommended 64Mb)
Further down the Drupal report says: PHP MEMORY LIMIT -1 (Unlimited)
without any error, indicating to me that Drupal is happy.
I suggest that a value of '-1' should be acceptable to CiviCRM.