unescape("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789
unescape("%40%2A%5F%2B%2D%2E%2F")
@*_+-./
unescape("%40%2a%5f%2b%2d%2e%2f")
@*_+-./
unescape("%20")
 
unescape("%C4%80%E3%81%82")
Āあ
unescape("Āあ")
Āあ
unescape("%0A")


unescape("%u0100")
0100
unescape("aaa%")
aaa
unescape("aaa%z")
aaa
unescape("aaa%zz")
aaaz
unescape("aaa%4")
aaa
unescape("aaa%4z")
aaa
unescape("aaa%4zz")
aaaz
unescape("%")

unescape("%%")

unescape("%_a%@b%.c")
abc
unescape("")

unescape()
undefined