Why align all pinned array payloads on 16 bytes?

Hi, I just found out we currently align all pinned array payloads to 16 bytes and I'm wondering why. I don't see any comments/notes on this, and it's also not part of the primop documentation. We also have another primop for aligned allocation: newAlignedPinnedByteArray#. Given that alignment behavior of newPinnedByteArray# is not documented and we have another one for aligned allocation, perhaps we can remove alignment in newPinnedByteArray#. Does anyone remember what was the motivation for always aligning pinned arrays? Thanks Ömer