eladmarg commented on pull request #345:
URL: https://github.com/apache/lucenenet/pull/345#issuecomment-696868907


   if we don't gain any performance, I prefer to stick with readability, 
   
   so acceptable by me is == null -> is null
   a is MyClass mc (assuming performance are the same)
   
   keep != null, when c# 9.0 is out, we'll replace all with is not null
   


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