a bug for for i in [0...N] await ...

[neutra]

we know that in coffeescript/iced
[0...4] is [0,1,2,3], and [0..3] is [0,1,2,3] too.
but follow code make different result:
x = []
fun1 = (cb) -> cb 1
for i in [0..3]
await fun1 defer(x[i])
==> x is [1,1,1,1]
for i in [0,1,2,3]
await fun1 defer(x[i])
==> x is [1,1,1,1]

for i in [0...4]
await fun1 defer(x[i])
x is [1,1,1,1,1]

i found that "for i in [0...4] await ..." generate js code like
....
if (!(i <= 4)) {
return _break();
} else {
.....
and iced "for i in [0..3] await ..." generate code all the same except it's 3 rather than 4.
....
if (!(i <= 3)) {
return _break();
} else {
.....