pkg unicode, var Kayah_Li *RangeTable
pkg unicode, var Kharoshthi *RangeTable
pkg unicode, var Khmer *RangeTable
pkg unicode, var L *RangeTable
pkg unicode, var Lao *RangeTable
pkg unicode, var Latin *RangeTable
pkg unicode, var Lepcha *RangeTable
pkg unicode, var Letter *RangeTable
pkg unicode, var Limbu *RangeTable
pkg unicode, var Linear_B *RangeTable
pkg unicode, var Lisu *RangeTable

// We avoid dependency on the unicode package, but check validity of the implementation
// in the tests.
func isSpace(r rune) bool {
	if r <= '\u00FF' {
		// Obvious ASCII ones: \t through \r plus space. Plus two Latin-1 oddballs.
		switch r {
		case ' ', '\t', '\n', '\v', '\f', '\r':
			return true
		case '\u0085', '\u00A0':
			return true
		}
		return false
	}
	// High-valued ones.

	expect = "a to zed"
	if string(m) != expect {
		t.Errorf("rot13: expected %q got %q", expect, m)
	}

	// 5. Drop
	dropNotLatin := func(r rune) rune {
		if unicode.Is(unicode.Latin, r) {
			return r
		}
		return -1
	}
	m = Map(dropNotLatin, []byte("Hello, 세계"))
	expect = "Hello"
	if string(m) != expect {
		t.Errorf("drop: expected %q got %q", expect, m)
	}