Derek it's because portalocker changes 'w' to 'a' when it opens the file so 
then it has to emulate 'w'.  
  
I have no freaking idea why portalocker does this instead of just using 
'w', I'm guessing it was done to get around a quirk that once existed.  
  
OTOH I don't see why truncate is not being allowed and why I have never had 
this problem.  

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