loosen restriction on input array for cache type assertion #142
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This fixes an accidental regression in our support of non-
Array
ForwardDiff inputs (thanks for pointing this out, @tkelman).I'm a tad concerned that this might damage performance for non-
AbstractArray
inputs, since the fallback here uses the result ofndims
in a type parameter.It would be nice if there were something like
similar_type
we could call on array-likes, which would allow us to generalize the array types used by the cache types.