Commits on Jul 14, 2022

1. Make IOFS.ReadDir check for fs.ReadDirFile …

   And implement `fs.ReadDirFile` for `BasePathFile`.
   
   There are other `File` implementations that could also benefit from the above, but
   this is a start.
   
   The primary motivation behind this is to allow `fs.WalkDir` use the native
   implementation whenever possible, as that new function was added in Go 1.16 with
   speed as its main selling point.
   
   This commit also adds a benchmark for `fs.WalkDir` that, when compared to the main branch:
   
   ```bash
   name        old time/op    new time/op    delta
   WalkDir-10     369µs ± 1%     196µs ± 3%  -46.89%  (p=0.029 n=4+4)
   
   name        old alloc/op   new alloc/op   delta
   WalkDir-10    85.3kB ± 0%    40.2kB ± 0%  -52.87%  (p=0.029 n=4+4)
   
   name        old allocs/op  new allocs/op  delta
   WalkDir-10       826 ± 0%       584 ± 0%  -29.30%  (p=0.029 n=4+4)
   ```
   
   Fixes spf13#365

   

   bep committed Jul 14, 2022
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