Hey - I'm trying to add some type stubs to my build and having issues. I've added a

type_stubs

directory to the root of my repo and added the following to my `pants.toml`:

[source]
root_patterns = ['/', 'type_stubs']

I added a

BUILD

file in `type_stubs`:

$ cat type_stubs/BUILD 
python_requirement_library(
   name = 'numpy_stubs',
   requirements=[
      'numpy-stubs@ git+<https://github.com/numpy/numpy-stubs@c49d2d6875971a669a166ea93ef998911af283a1>'
   ]
)

That didn't cause any errors but mypy didn't pick up the stubs for numpy so I also added this to my

BUILD

target that uses `numpy`:

python_library(
   dependencies=[
      '//type_stubs/:numpy_stubs'
   ]
)

which causes the following error:

Exception message: 1 Exception encountered:

  InvalidSpecPath: Address spec has un-normalized path part 'type_stubs/'

Removing the leading

//

didn't help either. What am I doing wrong? And, is there an easier way to add stubs for things like numpy?