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Quite well-tested since it's an upstream of a code used in DiffEq for a few years in https://github.com/SciML/DiffEqBase.jl/blob/v6.73.2/src/init.jl#L78-L83 . It didn't seem like the triangular solves were wrapped (when I wrote this) so it's actually allocating internally, so maybe that could be improved, but it's at least correct.