- change the uses of abi_for_size to simd_abi::deduce.
- remove the const in const_where_expression's template.
A few comments; more to come after the earlier patches land.
Is this deliberately incomplete?
The member type shall be present if and only if:
Will a later patch fix this up?
We don't need the comments any more that P0820 has been adopted.
Isn't this now named split?