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+# SRFI-259 for CHICKEN
+
+This is an implementation of SRFI-259 for CHICKEN.
+
+Notable features:
+
+* Different than `extend-procedure`, because `extend-procedure` is
+  stateful.
+* Uses an efficient set type (integer maps) to store tags.
+
+This is the first time I've written low-level CHICKEN code: use at your own
+risk.