Path spec WbX are all "Weight for Guard+Exit-flagged nodes for BEGIN_DIR requests"
path-spec.txt line 354 to 357 state:
Wbg - Weight for Guard+Exit-flagged nodes for BEGIN_DIR requests
Wbm - Weight for Guard+Exit-flagged nodes for BEGIN_DIR requests
Wbe - Weight for Guard+Exit-flagged nodes for BEGIN_DIR requests
Wbd - Weight for Guard+Exit-flagged nodes for BEGIN_DIR requests
I don't think it's correct that they are all the Weight for Guard+Exit-flagged nodes?