Fix typed nil hook support #15
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References mitchellh#278
Typed
nils which are the result of a type decoding hook seem to result in incorrect decoding behavior. Specifically, thenilis turned into an actual value due to the way thenilcheck works, instead of preserving thenil. Previously we were returning just untypednils but ever since mitchellh#205 this seems to no longer be supported while chaining multiple hooks.I've added a test which reproduces this issue, and a possible fix. Please also take a look at the comments in the original PR.