def pack64
import bend-collections-laws-math@1.0.0.0/src/math/f64.bend as F64import Base
import bend-collections-laws-math@1.0.0.0/src/math/u64.bend as W
import bend-collections-laws-math@1.0.0.0/src/math/w64.bend as X
116def pack64(+w: W.U64) -> F64:
117 Bits{X.lo(w), X.hi(w)}