* Implement a simple destroy method.
* Add tests for it
* Refactor code, so file is actually read only once. However, due
to the nature how provider tests are run, we need to ensure that
the file is read before we open it to write it.
Without this patch the resource whole_line would be included in the
stable stdlib module shipping in PE 1.2. Ideally the name will be
stable and unchanging in the future.
There was quite a bit of concern over whole_line being an unwise name.
file_line appears to be the most suitable name and least likely to need
another rename in the future.