Dear Linas,
Thank you so much! I did indeed miss your earlier responses and I appreciate your reaching out to me!
I downloaded the current guile code in git and will give it a try. But, given that this is not a stable release, I am not sure if we can really use it for our purposes.
Do you or Ludovic know when a stable 2.2 version will be released? From stability point of you, would it be better to use a patched version of 2.0.11 that handles the case we noticed (e.g. don't attempt to remove items from hash table if len = 0)?