// utf8.RuneError.
	for _, r := range []rune{-1, utf8.MaxRune + 1} {
		var b Builder
		b.WriteRune(r)
		check(t, &b, "\uFFFD")
	}
}

var someBytes = []byte("some bytes sdljlk jsklj3lkjlk djlkjw")

var sinkS string

func benchmarkBuilder(b *testing.B, f func(b *testing.B, numWrite int, grow bool)) {
	b.Run("1Write_NoGrow", func(b *testing.B) {
		b.ReportAllocs()
		f(b, 1, false)
	})