It would be really cool to declare multiple modules in the same file, somehow. Also, the Janet community's generally against the word namespace, saying we don't have them. (I don't fully grok why not.)
The `import` macro extends the current environment with prefixed symbols from another environment. But the environment is a first-class object that you can hold and manipulate and use in arbitrary ways — `require` is the lower level primitive that `import` is built on.