type Foo struct {
		N Number
	}
	x := Foo{Number(`invalid`)}

	if _, err := Marshal(&x); err == nil {
		t.Fatalf("Marshal error: got nil, want non-nil")
	}
}

func TestMarshalErrorAndReuseEncodeState(t *testing.T) {
	// Disable the GC temporarily to prevent encodeState's in Pool being cleaned away during the test.
	percent := debug.SetGCPercent(-1)
	defer debug.SetGCPercent(percent)