Dispatch based on SeqLikeType.__args__

[ericmjl]

Also a quick note: when dispatching for SeqLike, I guess we can use SeqLikeType.__args__ as the type instead of hardcoding a list of potential types, otherwise it's hard to keep them consistent (since I saw there's a plan to include torch.tensor)

Originally posted by @pagpires in #41 (comment)

[ericmjl]

@pagpires do let us know if you'd like to make this happen! Happy to assign it to you.

[pagpires]

sure! happy to

[pagpires]

PR: #46
Note that the forward-ref should be removed or replaced (e.g. "torch.tensor" removed, "np.ndarray" replaced with the np.ndarray) to be compatible with dispatch. I also found the circular dependency of SeqLike and SeqLikeType a bit confusing. Let me know if I missed the context for this design or there's a better way.