Fix type instability for vec[1, end] indexing#526

ChrisRackauckas merged 1 commit intoSciML:masterSciML/RecursiveArrayTools.jl:masterfrom

ChrisRackauckas-Claude:fix/type-stability-end-indexingChrisRackauckas-Claude/RecursiveArrayTools.jl:fix/type-stability-end-indexingCopy head branch name to clipboard