var f16 float32 = 1.1e+10
	assert(f01 == -f00, "f01")
	assert(f02 == -f01, "f02")
	assert(f03 == f04, "f03")
	assert(f04 == f05, "f04")
	assert(f05 == f06, "f05")
	assert(f07 == -f08, "f07")
	assert(equal(f09, 1/f10), "f09")
	assert(f11 == f09, "f11")
	assert(f12 == f10, "f12")
	assert(equal(f13, f09/10.0), "f13")
	assert(equal(f14, f12/10.0), "f14")
	assert(equal(f15, f16/1e20), "f15")

	// character

func f04[S2 ~[]E2, E1 ~byte, S1 ~[]E1, E2 ~byte](S1, S2) {}
func f05[E1 ~byte, S2 ~[]E2, S1 ~[]E1, E2 ~byte](S1, S2) {}
func f06[E2 ~byte, S2 ~[]E2, S1 ~[]E1, E1 ~byte](S1, S2) {}
func f07[S2 ~[]E2, E2 ~byte, S1 ~[]E1, E1 ~byte](S1, S2) {}
func f08[S1 ~[]E1, E2 ~byte, S2 ~[]E2, E1 ~byte](S1, S2) {}
func f09[E2 ~byte, S1 ~[]E1, S2 ~[]E2, E1 ~byte](S1, S2) {}
func f10[S2 ~[]E2, S1 ~[]E1, E2 ~byte, E1 ~byte](S1, S2) {}