world: publish decorated region batches

internal/world/vanilla_bench_test.go

@@ -10,3 +10,14 @@ func BenchmarkGenerateVanilla(b *testing.B) {
 		_ = g(int32(i), 0)
 	}
 }
+
+func BenchmarkGenerateVanillaRegionBatch(b *testing.B) {
+	_, batch := NewVanillaRegionGenerators(12345)
+	b.ResetTimer()
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		if _, err := batch(int32(i*3), 0); err != nil {
+			b.Fatal(err)
+		}
+	}
+}