Question - `hint_num_files_per_dir` recursive or not?
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Description
I'm just looking for some clarity on the documentation for [hint_num_files_per_dir](https://facebook.github.io/watchman/docs/config#hint_num_files_per_dir).
Should this be set to the largest number of files in a single directory, one level deep, or should it contain the number of files in all the subdirectories under it as well? I've assumed the former for now.
E.g. with this setup:
```
directory_a/
├─ file_a
├─ file_b
├─ directory_b/
│ ├─ file_c
│ ├─ directory_c/
│ │ ├─ file_d
```
Is `directory_a`'s `num_files_per_dir` 2 or 4?
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