This is already a partly solved challenge. Text streams don't magically come into existence, programs needs STDIN, STDOUT and STDERR at their disposal to use th

This is already a partly solved challenge. Text streams don't magically come into existence, programs needs STDIN, STDOUT and STDERR at their disposal to use them. All you really need are scalars, sequences and mappings to fully express any data structure. Tagged types would be sugar on top but it could quickly add unwanted complexity. All you need is a shell capable of marshalling data between the different programs piped together. Powershell is a nice idea but it only runs .NET code and that's a limitation I can't live with.