Prevent MemMapFs.Chmod from changing all mode bits #249
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I ran into an issue where my program called
fs.Chmodand it changed from a directory to a regular file. This one had me stumped for weeks 馃槄After checking
os.Chmod's docs, I bit-masked the part Chmod is permitted to set, then OR'd it with the file's other previous mode bits. I also added a test to check the file type after setting all permission bits to 0.