Remove FillArrays dependency to reduce import times #257
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It was added in b3ed973 but in SciML/DataInterpolations.jl#129 it has been identified as one of the main import time contributions. It's only necessary for the Zygote rules, and not even ChainRules but specifically
Zygote.@adjoint
, so they are simply moved to a Zygote extension and use FillArrays from Zygote to achieve the same goal.