feat(kv_typed): impl FromBytes for all SmallVec (use const generics)

tools/kv_typed/src/from_bytes.rs

@@ -55,23 +55,19 @@ impl FromBytes for String {
     }
 }
 
-macro_rules! impl_from_bytes_for_smallvec {
-    ($($N:literal),*) => {$(
-        impl<T> FromBytes for SmallVec<[T; $N]>
+impl<T, const N: usize> FromBytes for SmallVec<[T; N]>
 where
     T: Copy + zerocopy::FromBytes,
+    [T; N]: smallvec::Array<Item = T>,
 {
     type Err = LayoutVerifiedErr;
 
     fn from_bytes(bytes: &[u8]) -> Result<Self, Self::Err> {
         let layout_verified = zerocopy::LayoutVerified::<_, [T]>::new_slice(bytes)
-                    .ok_or_else(|| LayoutVerifiedErr(stringify!(T)).into())?;
+            .ok_or(LayoutVerifiedErr(stringify!(T)))?;
         Ok(SmallVec::from_slice(layout_verified.into_slice()))
     }
 }
-    )*};
-}
-impl_from_bytes_for_smallvec!(1, 2, 4, 8, 16, 32, 64);
 
 impl<T> FromBytes for Vec<T>
 where