types: Implement generic encoder functions #170
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Adds
EncodeSlice,EncodeSliceCast,EncodeSliceFn, and their decoder counterparts, as well asCastmethods for increased type safety. This makes most encoding methods more succinct, but the real motivation was that it allows us to centralized the handling of malicious slice lengths (see discussion on #166). I will grudgingly admit that generics solved a real problem here. 馃槤I'm not crazy about the API; it would be nicer if we could somehow unify these three functions, and if we could ditch the
Castmethods. I explored replacingEncodeSliceFnwith aBasicEncodabletype (wrappinguint64,bool, etc.), but it was kinda gross, requiring a run-time type-switch on every encode call.I ran one manual benchmark to see whether this had a big performance impact, and it looked ok. We should benchmark it more thoroughly though.