A very common operation when trying to write package which works with unitful quantities is getting the unitless element-type. This is required to find the right eps or set the tolerance to the correct Number type. However, I am not sure of a completely generic way to handle this. typeof(first(one(u))) works well in a pinch, but I am noticing an issue with GPUArrays which do not have indexing and thus don't have first defined. So the only way I know of to always get the unitless element type is eltype(u./u), which has an extra operation just to grab the type.
Is there a generic function to strip the units off of a type? Some unitless(T) to get whatever the type of the non-unit part is? That would be a clear way to implement this.
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