Can somebody explain this?

> getDirectoryContents inD

["..","#sanity.txt#",".","sanity.txt","etc.txt","patchTagDir.txt","jail.txt","notjail.txt","alldata.txt","allobjs.txt","namesNSizes.txt"]

> filterM doesFileExist =<< getDirectoryContents inD

> ["sanity.txt"]
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