code points:	0x01, 0x7f
UTF-8:		0x01, 0x7f
UTF-16:		0x01, 0x7f

code points:	0x80, 0x7ff
UTF-8:		0xc2, 0x80, 0xdf, 0xbf
UTF-16:		0x80, 0x7ff

code points:	0x800, 0xffff
UTF-8:		0xe0, 0xa0, 0x80, 0xef, 0xbf, 0xbf
UTF-16:		0x800, 0xffff

code points:	0x100000, 0x10ffff
UTF-8:		0xf4, 0x80, 0x80, 0x80, 0xf4, 0x8f, 0xbf, 0xbf
UTF-16:		0xdbc0, 0xdc00, 0xdbff, 0xdfff

code points:	0x01, 0xd7ff
UTF-8:		0x01, 0xed, 0x9f, 0xbf
UTF-16:		0x01, 0xd7ff

code points:	0xe000, 0xffff
UTF-8:		0xee, 0x80, 0x80, 0xef, 0xbf, 0xbf
UTF-16:		0xe000, 0xffff

code points:	0x10000, 0x10ffff
UTF-8:		0xf0, 0x90, 0x80, 0x80, 0xf4, 0x8f, 0xbf, 0xbf
UTF-16:		0xd800, 0xdc00, 0xdbff, 0xdfff