def len
import bend-toon-codec@0.1.0.0/src/hdr.bend as Hdrimport Base
import bend-toon-codec@0.1.0.0/src/num.bend as N
151def len(+r: N.Sp) -> Result<&2, &2, String, Hdr>:
152 match r:
153 case N.Sp{ds, rest}:
154 len.pick(len.ok(ds), U32.read(ds), rest)