I thought grep will *only* return the elements of the array for which the first expression is true. Since the first expression glob("$_/f*") is only true for 'dir1', it should only return that element of the directory list (even though glob returns 3 files in that directory). The glob finds no elements in the other 2 directories, so it should be undefined which would evaluate as false.
I don't understand why the elements of glob("$_/f*") returned for the first directory entry seemingly spill over to subsequent directories in the (implicit) grep iteration.
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