// Checked inline byte buffer for the Rust counterparts; not a Goose layout.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct SmallBytes<const N: usize> { data: [u8; N], len: usize }
impl<const N: usize> SmallBytes<N> {
    pub fn new(bytes: &[u8]) -> Self {
        let mut value = Self { data: [0; N], len: 0 };
        value.append(bytes);
        value
    }
    pub fn append(&mut self, bytes: &[u8]) {
        let end = self.len.checked_add(bytes.len()).expect("length overflow");
        assert!(end <= N, "inline byte capacity exceeded");
        self.data[self.len..end].copy_from_slice(bytes);
        self.len = end;
    }
    pub fn as_bytes(&self) -> &[u8] { &self.data[..self.len] }
}