Macro impl_number

macro_rules! impl_number {
    (32: { $($name32:ident,)* }, 64: { $($name64:ident,)* },) => { ... };
    ($({ $name:ident, $inner:ty, $as_name:ident, $from_name:ident, $next_name:ident, $append_name:ident },)*) => { ... };
}