```
```

morph_nat_as_u8_to_u16 ()
      ℕ ~ native.UInt8
-->   ℕ ~ native.UInt16
```*dst = *src;```

morph_nat_as_u16_to_u32 ()
      ℕ ~ native.UInt16
-->   ℕ ~ native.UInt32
```*dst = *src;```

morph_nat_as_u32_to_u64 ()
      ℕ ~ native.UInt32
-->   ℕ ~ native.UInt64
```*dst = *src;```