Missing EPERM removing read-only files on windows

[isaacs]

C:\>node -p "require('fs').unlink('minimatch/.git/objects/pack/pack-8b98e6c46b42
5c4dad6aa937a8a3300ba0e35785.idx',console.log)"
undefined
{ [Error: EPERM, unlink 'C:\minimatch\.git\objects\pack\pack-8b98e6c46b425c4dad6
aa937a8a3300ba0e35785.idx']
  errno: 50,
  code: 'EPERM',
  path: 'C:\\minimatch\\.git\\objects\\pack\\pack-8b98e6c46b425c4dad6aa937a8a330
0ba0e35785.idx' }

C:\>node -p "require('rimraf')('minimatch/.git/objects/pack/pack-8b98e6c46b425c4
dad6aa937a8a3300ba0e35785.idx',console.log)"
undefined
null

[isaacs]

Many windows users have made it clear that the EPERM is unwanted, and that it should just go ahead and blow away read-only dirs. Closing, "works as intended".