Functional datatypes in Guile

[Jessica Tallon]

Hello,

I've been thinking how it'd be nice to have available in Guile a number of 
purely functional datatypes, these being hashmaps, vectors, and sets. I've 
been wondering what folks have been using for these with the idea that we 
could bring them into guile for ease of use.

I know of Andy Wingo's fash[0] and fector[1]. What do folks like to use?

Thanks,
Jessica.

[0] https://wingolog.org/pub/fash.scm
[1] https://wingolog.org/pub/fector.scm