multi: remove x/exp/maps dependency

fn/map.go

@@ -2,13 +2,13 @@ package fn
 
 import (
 	"fmt"
-
-	"golang.org/x/exp/maps"
+	"maps"
+	"slices"
 )
 
 // KeySet converts a map into a Set containing the keys of the map.
 func KeySet[K comparable, V any](m map[K]V) Set[K] {
-	return NewSet(maps.Keys(m)...)
+	return NewSet(slices.Collect(maps.Keys(m))...)
 }
 
 // NewSubMapIntersect returns a sub-map of `m` containing only the keys found in

fn/set.go

@@ -1,6 +1,9 @@
 package fn
 
-import "golang.org/x/exp/maps"
+import (
+	"maps"
+	"slices"
+)
 
 // Set is a generic set using type params that supports the following
 // operations: diff, union, intersection, and subset.
@@ -92,7 +95,7 @@ func (s Set[T]) Equal(other Set[T]) bool {
 
 // ToSlice returns the set as a slice.
 func (s Set[T]) ToSlice() []T {
-	return maps.Keys(s)
+	return slices.Collect(maps.Keys(s))
 }
 
 // Copy copies s and returns the result.