More elaborate todo

secret_loader/__init__.py

@@ -27,7 +27,9 @@ Secret loading order:
 
 ## TODO
 
-- [ ] Mlock secrets to prevent leakage to swap file.
+- [ ] Avoid leakage to swap files.
+    * Possibly Mlock? [Does not seem to work](https://stackoverflow.com/questions/29524020/prevent-ram-from-paging-to-swap-area-mlock)
+    * Alternatively use [mmap](https://docs.python.org/3/library/mmap.html) and [memoryview](https://stackoverflow.com/questions/18655648/what-exactly-is-the-point-of-memoryview-in-python)?§
 - [ ] Wrap secrets in intelligent strings:
     * Instead of returning None on unloaded, return UnknownSecret, that produce
       error when formatted.