b7cdd93f3e
More APIs for `la_arena::IdxRange`
```rust
impl<T> ExactSizeIterator for IdxRange<T>;
impl<T> Arena<T> {
pub fn alloc_many<II: IntoIterator<Item = T>>(&mut self, iter: II) -> IdxRange<T>;
}
```
1. There are no currently ways to get `IdxRange` without manually offseting `Idx`. Providing a method for multiple-allocation simplifies this process and makes it less error-prone.
2. `IdxRange: ExactSizeIterator` makes `iter.zip(range).rev()` possible. Since `Zip: DoubleEndedIterator` requires all its arguments to be `ExactSizeIterator`. It also ease the usage for, eg. `len()`.
3. Fixed a typo.
I noticed that `IdxRange::end` may be invalid. Is it good to return `Idx` instead of `RawIdx`?
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