slsets - Lists of symbols as sets

Age	Commit message (Collapse)	Author
6 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.