Common imports for the codec — the typed positioning amounts (4.bits(), 3.bytes()) used by #[br(pad_before = …)] etc., plus the EncodeExt trait that carries encode(writer) (the std feature).
4.bits()
3.bytes()
#[br(pad_before = …)]
EncodeExt
encode(writer)
std
pub use crate::BitAmount;
pub use crate::EncodeExt;