What is the motivation of this repo?

1. The language server doesn't understand defining methods with macros like @eval or ForwardDiff.@define_binary_dual_op. Defining methods within the module you're working on will result in them all being marked as undefined references, but if a dependency defines them, the LSP will be able see them. Therefore, it's nice to silo off all macro-defined methods into a separate repo.
2. Sometimes it's nice to work with and do math with tuples.