Removes allocations with get_tmp that occur in some cases #125
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Not doing so leads to this method also being used for non-Dual LArrays, which currently incurs (unnecessary) allocations.
Bumped patch version; added ForwardDiff to dependencies (need just the type definition...)
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Specifically when
get_tmp(cache::PreallocationTools.DiffCache, u:LArray{T, ...}where T is not a ForwardDiff.Dual, the method defined for Duals is used (which uses ArrayInterfaceCore.restructure --> allocations, even though we should just get the normal cache back, not the dual cache).The changes introduced dispatch the present
get_tmponly on Duals, so that for T <: Number the fallback method for u::AbstractArray in PreallocationTools is used (https://github.com/SciML/PreallocationTools.jl/blob/addfd170cb69f98778f7e5f40a3d9ab352c99b10/src/PreallocationTools.jl#L61)