Type Independent Nodes

[oparisblue]

We need some nodes which work on many different data types, e.g.

• Head: gets the first (lines / rows / digits / bytes / etc) of (text / tables / numbers / files / etc)
• Tail: gets the last (lines / rows / digits / bytes / etc) of (text / tables / numbers / files / etc)

Feel free to edit this and add more in! I'm sure there's heaps that would apply (maybe even some of the existing nodes could be converted to this format?) I just can't think of any at this time :)

---

Do we need to extend the type system extension to do this, or would these nodes just take and output "Any"s?