slset - Lists of symbols as sets

Age	Commit message (Collapse)	Author
4 days	Use singular "slset" instead of plural "slsets"	Peter Bex

5 days	Allow with-reified-slset to return values as well	Peter Bex
	Otherwise, it'll be a bit awkward if we do have something more useful to return. And we wouldn't be able to get at the slset's list so easily.
5 days	Allow reification of slsets to get fast adjoin and membership testing	Peter Bex

5 days	Add slset-delete and slset-contains?	Peter Bex
	Not strictly needed, but could be helpful and completes the operations. Also, if we ever reimplement it using some other strategy, this might be more useful.
5 days	Make sure lset-adjoin removes markings on the adjoined elements	Peter Bex
	Add a test to ensure this won't happen again.
5 days	Initial implementation of slsets egg	Peter Bex
	This implements sets of symbols as lists, like in the srfi-1 lset operations. It maintains the benefit of using lists for everything, but not having to pay the quadratic performance penalty that srfi-1 entails. We achieve this by using plist operations to "mark" items so we have to visit the list "set" only a fixed number of times.