add variable system + fix bugs here and there.

internal/gentools/maps.go

@@ -1,7 +1,7 @@
 package gentools
 
 func CopyMap[K comparable, V any](m map[K]V) map[K]V {
-	m2 := make(map[K]V, len(m))
+	m2 := make(map[K]V, len(m)+1)
 	for k, v := range m {
 		m2[k] = v
 	}