I've encountered a few pieces of math that are more naturally expressed in 0-based indexes and it is pretty easy to define them in Julia using arbitrary indexin

I've encountered a few pieces of math that are more naturally expressed in 0-based indexes and it is pretty easy to define them in Julia using arbitrary indexing. TaylorSeries.jl is a great example of this. x = x_0 + x_1 t + ... Then indexing into it with x[0] would give the zero-th order Taylor coefficient.