[RFC] Change the structure of TreeFs?

[chshersh]

It was proposed during the work on #333 to implement TreeFs like this:

data TreeFs
    = Dir (Map FilePath TreeFs)
    | File Text

This structure has some benefits:

1. Automatic sorting of the tree by filepath.
2. Eliminating duplicate FilePath cases.

The new implementation can make code more maintainable. Or can make it less maintainable. Hard to tell now. This is just a question, whether it's worth it and how should we deal with duplicate and unsorted paths. Alternative proposals are accepted as well!

[patrickt]

Alternatively you could pull in directory-tree.