```
% string range [string insert [string repeat a 0x80000000] end-0x7fffffff X] 0 10
Xaaaaaaaaaa
```

I expected "aXaaa..."

Along the same lines,

```
% set s [string repeat a 0xffffffff]; string length $s
4294967295
% string index $s end-0xfffffffe
a
% string range $s end-0xfffffffe  end-0xfffffffe
  <- (empty string)
```

`string index` gives correct result but not `string range`.

Fixed somewhere in the TIP 660 commits. Added tests in [ed26748c6b]

Along the same lines,

```
% string length [string range $s end-0x7fffffff end-0x7ffffffe]
2147483664
% string length [string range $s end-0x7ffffffd end-0x7ffffffd]
1
```

So the breakage seems to occur right at end-INT_MAX. I don't understand TclEncodeIndex well enough to tell if the bug is there or in the caller (range command)

/Ashok