Adding adelegates decorator to a method preventsTypeDispatch from creating the correct dispatching table.

Withoutdelegates, the dispatch forTensorAudio.create is correct:

classTensorAudio(TensorBase):@classmethoddefcreate(cls,fn:str|Path,**kwargs):sig,sr=torchaudio.load(fn,**kwargs)returncls(sig,sr=sr)

TypeDispatch(TensorAudio.create) returns

(str,object) -> create(Path,object) -> create

But with delegates,TypeDispatch doesn't create the correct dispatch table:

classTensorAudio(TensorBase):@delegates(torchaudio.load)@classmethoddefcreate(cls,fn:str|Path,**kwargs):sig,sr=torchaudio.load(fn,**kwargs)returncls(sig,sr=sr)TypeDispatch(TensorAudio.create)

InsteadTypeDispatch(TensorAudio.create) returns:

(str,BinaryIO) -> create(str,str) -> create(str,PathLike) -> create(Path,BinaryIO) -> create(Path,str) -> create(Path,PathLike) -> create

TheBinaryIO,str, andPathLike in the type dispatch are fromtorchaudio.load. It's missing(str,object) and(Path,object). This incorrect dispatch prevents fromTensorAudio.create dispatching in a fastai datablock.

Previous versions of fastcore did not have this interplay betweendelegates andTypeDispatch, but I am not sure when it cropped up.