Revert "Revert "alien.data: <ref> doesn't need to zero memory.""

This reverts commit 01142121511d4b9338c84286d4efdd3c8d5a4665.
Revert "Revert "io.encodings: string>byte-array-fast can use (byte-array).""

This reverts commit af6975593756e353654b67b1bf1db7dd06f8c114.