code: function parseCacheEntryFlags (bits) {
    return {
      assumeValid: Boolean(bits & 0b1000000000000000),
      extended: Boolean(bits & 0b0100000000000000),
      stage: (bits & 0b0011000000000000) >> 12,
      nameLength: bits & 0b0000111111111111
    }
  }
docs: Extract 1-bit assume-valid, 1-bit extended flag, 2-bit merge state flag, 12-bit path length flag