Optimizer doesn't know that repeat block iteration count is only evaluated at the start of the loop

<img width="262" height="199" alt="Image" src="https://github.com/user-attachments/assets/a16b6073-9816-4985-9346-2a738f45772f" />

compiles to:

```js
b0.value = b1.value.length;
for (var a0 = (+b0.value || 0); a0 >= 0.5; a0--) {
b0.value = "bwah";
}
```

Doesn't realize that the variable is always an integer at the time it gets evaluated

Unclear if this comes up in real projects