feat: "atomic" get_handler_configs #10308
                
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          +39
        
        
          −9
        
        
          
        
      
    
  
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I think the root issue is eliminated by matching on a ETS table instead of looking up repeatedly.
Testcase is a bit shady, but hope its good enough (any tips are more than welcome).
Closes #9997
P.S. Something to note before review: in the issue, @jhogberg mentioned that previous behavior might not be unexpected, but I can't think of a reason where one would want this to fail.