Function to dump environment variables

I'd like a function to augment the capability of `env`- something like `dumpEnv` which would return all the available environment variables. If I write it, is there a decent chance it gets merged?

Start by locating the existing `env` template function and its tests in the repository. Confirm how environment variables are represented and what `dumpEnv` should return, then add coverage for the requested behavior and verify the test suite passes.

Written by the indexing model from the issue text.