Fast.words: def of lawful-bytes@0.1.1.0
Import: import lawful-bytes@0.1.1.0/fast.bend as Fast
Lines 39-41 of lawful-bytes@0.1.1.0/fast.bend: https://jend.leeeet.dev/read.txt?path=lawful-bytes@0.1.1.0/fast.bend&start_line=39&end_line=41

import Base

# How many words hold bytes from .. to-1 (0 when to <= from).
def words(+from: U32, +to: U32) -> Nat:
  Bool.pick(Nat, U32.is_le(to, from), 0n, U32.to_nat(((((to - 1 : U32) >> 2n : U32) - (from >> 2n : U32) : U32) + 1 : U32)))

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_le
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shrn
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat