fix crash when dropping PyBuffer after interpreter finalized
          #5242
        
          
      
      
        
          +174
        
        
          −2
        
        
          
        
      
    
  
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Fixes #4632
This adds a test that dropping
PyBuffer<T>after finalizing the interpreter won't cause a bad crash. We don't really support the interpreter lifecycle much (other than saying it'sunsafeto interact with due to risk of objects outliving the interpreter) but I think it's reasonable to attempt to avoid a segfault, at least.