case r >= 'a' && r <= 'z':
			return 'a' + (r-'a'+13)%26
		}
		return r
	}
	fmt.Printf("%s\n", bytes.Map(rot13, []byte("'Twas brillig and the slithy gopher...")))
	// Output:
	// 'Gjnf oevyyvt naq gur fyvgul tbcure...
}

func ExampleReader_Len() {
	fmt.Println(bytes.NewReader([]byte("Hi!")).Len())
	fmt.Println(bytes.NewReader([]byte("こんにちは!")).Len())
	// Output:
	// 3
	// 16
}

t?m!.&bog?gro?moc?t&en?opsgolb,?ude??g?ma2ibgy--nx??o&b!x??f?rex??rbgn--nx?s!.vog??x&am&jt?kt??x???y&4punu--nx?7rr03--nx?a&d!i&loh?rfkcalb??ot!.emyfilauqerp,??g!.segap,?lp?p!ila??rot?ssin?wdaorb??b!.&duolcym,fo?hcetaidem,lim?moc!.topsgolb,?vog??ab?gur??c!.&ca?dtl?gro?lim?m&oc!.&ecrofelacs.j,topsgolb,??t??orp?s&egolke?serp??ten?vog?zib??amrahp?nega??d&dadog?uts??e&kcoh?ltneb?n&dys?om?rotta??snikcm??g!.&gro?moc?oc?ten?ude?vog??olonhcet!.oc,?rene??hpargotohp?id?k!.&gro?moc?ten?ude??s??l!.&clp?d&em?...

t?m!.&bog?gro?moc?t&en?opsgolb,?ude??g?ma2ibgy--nx??o&b!x??f?rex??rbgn--nx?s!.vog??x&am&jt?kt??x???y&4punu--nx?7rr03--nx?a&d!i&loh?rfkcalb??ot!.emyfilauqerp,??g!.segap,?lp?p!ila??rot?ssin?wdaorb??b!.&duolcym,fo?hcetaidem,lim?moc!.topsgolb,?vog??ab?gur??c!.&ca?dtl?gro?lim?m&oc!.&ecrofelacs.j,topsgolb,??t??orp?s&egolke?serp??ten?vog?zib??amrahp?nega??d&dadog?uts??e&kcoh?ltneb?n&dys?om?rotta??snikcm??g!.&gro?moc?oc?ten?ude?vog??olonhcet!.oc,?rene??hpargotohp?id?k!.&gro?moc?ten?ude??s??l!.&clp?d&em?...

12400..12462  ; valid                  ;      ; NV8    # 5.0  CUNEIFORM NUMERIC SIGN TWO ASH..CUNEIFORM NUMERIC SIGN OLD ASSYRIAN ONE QUARTER
12463..1246E  ; valid                  ;      ; NV8    # 7.0  CUNEIFORM NUMERIC SIGN ONE QUARTER GUR..CUNEIFORM NUMERIC SIGN NINE U VARIANT FORM
1246F         ; disallowed                             # NA   <reserved-1246F>