pub fn var_vec_serialize_into<VLS: VariableLengthSerialize>(
buf: &mut [u8],
items: impl IntoIterator<Item = VLS>,
) -> Result<usize>pub fn var_vec_serialize_into<VLS: VariableLengthSerialize>(
buf: &mut [u8],
items: impl IntoIterator<Item = VLS>,
) -> Result<usize>