// Latin1
s = "a%2b%20def%00A0";
res = unescape(s);
assertEq(res, "a+ def\x00A0");
assertEq(isLatin1(res), true);

s = "a%2b%20def%00A0%u1200";
assertEq(unescape(s), "a+ def\x00A0\u1200");

// TwoByte
s += "\u1200";
assertEq(unescape(s), "a+ def\x00A0\u1200\u1200");

// Latin1
s = "abc \u00ff";
res = escape(s);
assertEq(res, "abc%20%FF");
assertEq(isLatin1(res), true);

// TwoByte
s += "\u1200";
res = escape(s);
assertEq(res, "abc%20%FF%u1200");
assertEq(isLatin1(res), true);