Commands for Type Interaction

1st chunk of `lang-guide/chapters/types/related_commands.md`

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# Commands that interact with types

The main type inspector in Nu is the `describe` command that
takes any data type on input and reports its type signature.

E.g.

```nu
[foo bar baz] | describe
# => list<string>
```

## Commands

- `describe`
- `inspect`
- `help`
- `into (subcommands)`
  - The into commands are used to cast one type into another.
- `ast`
  - In the branches of abstract syntax tree that describe the type of some element

Title: Commands for Type Interaction

Summary

This section describes commands in Nu that are used to interact with data types. The main command is `describe`, which reveals the type signature of a given data type. Other commands include `inspect`, `help`, `into` (for casting types), and `ast` (for examining the type within an abstract syntax tree).