def next.len
import bend-kit-postgres@0.3.0.0/codec.bend as Codecimport Base
import bend-kit-bytes@0.3.3.0/bytes.bend as Bytes
693def next.len(+pos: U32, r: Bytes.Bytes & U32) -> Reader & Next:
694 (buf, +len) = r
695 next.room(Bytes.fits(len, pos, 5), pos, len, buf)