alamb commented on issue #996:
URL: https://github.com/apache/arrow-rs/issues/996#issuecomment-986042173
I reviewed the code a bit more, and the comments make a great point:
```
/// `ArrowNativeType` is public so that it can be used as a trait bound
for other public
/// components, such as the `ToByteSlice` trait. However, this means
that it can be
/// implemented by user defined types, which it is not intended for.
```
Meaning that if a user implements `ArrowNativeType` for their types, this
will result in undefined behavior.
I also looked more carefully at Buffer and it effectively allows
reinterpreting arbitrary `bytes` as different types, so I am not sure that
behavior is safe...
What probably should be done is make `MutableBuffer::typed_data` unsafe
instead as the docs there say very specifically
```
/// # Safety
/// This function must only be used when this buffer was extended with
items of type `T`.
/// Failure to do so results in undefined behavior.
```
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