Remove special cases for AbstractFiniteDifference
#94
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Based on the discussion in #2, it seems the special cases for
AbstractFiniteDifference
only exist because FiniteDifferences mutated the inputs in previous releases (also, the checks don't seem completely consistent). This FiniteDifference behaviour was a bug and fixed in version 0.12.28 (JuliaDiff/FiniteDifferences.jl#223).This PR removes the special cases and checks if tests pass with the latest FiniteDifferences release.