false positive on uninitialized local variables for fixed length arrays

i see "is a local variable never initialized" for a fixed length array, for example:

```
address[8] memory foo;
```

even if i loop over `foo` like:

```
address[8] memory foo;
for (uint256 i_ = 0; i_<8;i_++) {
foo[i_] = address(0);
}
```

slither still says it is never initialized.