llama::One is insufficiently aligned

[bernhardmgruber]

llama::One represents and maintains storage for a single record value. From the perspective of the compiler however, it is just a byte array plus the mapping and an empty array dimension coord. The latter two occupy no space and are optimized away by [[no_unique_address]]. The compiler thus computes an alignment of 1 for a llama::One. However, on access, bytes inside a llama::One are reinterpreted as types with higher than one alignment requirements. llama::One itself thus needs to be aligned properly depending on the contained record values.

[bernhardmgruber]

The problem is even reaching further, because in principle every View with blobs that contain the storage themselves might be insufficiently aligned. We might need to change the allocator interface to support requesting sufficiently aligned blobs.