Hash.sip.keep: def of bend-kit-hash@0.3.0.2
Import: import bend-kit-hash@0.3.0.2/hash.bend as Hash
Lines 627-629 of bend-kit-hash@0.3.0.2/hash.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-hash@0.3.0.2/hash.bend&start_line=627&end_line=629

import Base

# The low n bytes of w, for n <= 4, so bytes past len never reach the hash.
def sip.keep(+w: U32, +n: U32) -> U32:
  Bool.pick(U32, U32.is_lt(n, 4), (w .&. (U32.shln(1, U32.to_nat((n * 8 : U32))) - 1) : U32), w)

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=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_lt
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.mul
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shln
  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