
List of known CSA bugs:

* I suspect that, al least with mawk(1), referencing an undefined array
  element causes that element to become defined, althoug with an empty
  value. The effect of this behavior, although annoying, should not
  be armful, as if the referenced element is not-null then it will be
  seen by the program with the correct value, while if it is null then
  it will be seen with an empty value. This happens with any arrays,
  including the ENVIRON[] one, although changes to the latter still have
  a local scope and are never visible to subprograms.

