- `NextIf` iterator trait that yields the next element iff some predicate holds
- `u64_from_u32s`, `u32s_from_u64`, `u32_from_u16s`, `u16s_from_u32` functions
- moved `can_transmute` to `mem` module, added `is_same_size` and `is_aligned`
functions
- `copy_from` function for `TaggedAtomicPtr`
- attempt at a sync queue?
- `is_whitespace` function
