_        ___  ____ ____  ____              _
  |_|_ _   / _ \/ ___/ ___||  _ \   __ _  ___| |_
  _|_||_| | | | \___ \___ \| |_) | / _` |/ __| __|
 |_||_|_| | |_| |___) |__) |  __/ | (_| | (__| |_
  |_|_|_|  \___/|____/____/|_|     \__,_|\___|\__|

  OSSP act - Abstract Container Types

  TODO

  - es sollte custom/domain-specific hash functions geben,
    die wissen, welche Keys reinkommen und auf diese
    spezzialisiert sind!
    Beispielsweise sollte bei Key=Pathname nur auf
    die letzten Bytes gehasht werden, etc.

  - directory shrink?

  - heap, pqueue?

             "`Reuse an expert's code' is the right advice for most people.
              But it's a useless advice for the experts writing the code
              in the first place.               -- Dan J. Bernstein

    Design Goals:
    o allows low-level adjustments of data structures
    o uses a general contexts concept (shared memory support, user attachments)
    o is thread-safe + reentrant ?
    o allows the use of arbitrary user key/values
    o allows key/values to be loans or gifts