setRangeValue

    pub fn setRangeValue(self: *Self, range: Range, value: bool) void {
        assert(range.end <= self.bit_length);
        assert(range.start <= range.end);
        if (range.start == range.end) return;

        const start_mask_index = maskIndex(range.start);
        const start_bit = @as(ShiftInt, @truncate(range.start));

        const end_mask_index = maskIndex(range.end);
        const end_bit = @as(ShiftInt, @truncate(range.end));

        if (start_mask_index == end_mask_index) {
            var mask1 = std.math.boolMask(MaskInt, true) << start_bit;
            var mask2 = std.math.boolMask(MaskInt, true) >> (@bitSizeOf(MaskInt) - 1) - (end_bit - 1);
            self.masks[start_mask_index] &= ~(mask1 & mask2);

            mask1 = std.math.boolMask(MaskInt, value) << start_bit;
            mask2 = std.math.boolMask(MaskInt, value) >> (@bitSizeOf(MaskInt) - 1) - (end_bit - 1);
            self.masks[start_mask_index] |= mask1 & mask2;
        } else {
            var bulk_mask_index: usize = undefined;
            if (start_bit > 0) {
                self.masks[start_mask_index] =
                    (self.masks[start_mask_index] & ~(std.math.boolMask(MaskInt, true) << start_bit)) |
                    (std.math.boolMask(MaskInt, value) << start_bit);
                bulk_mask_index = start_mask_index + 1;
            } else {
                bulk_mask_index = start_mask_index;
            }

            while (bulk_mask_index < end_mask_index) : (bulk_mask_index += 1) {
                self.masks[bulk_mask_index] = std.math.boolMask(MaskInt, value);
            }

            if (end_bit > 0) {
                self.masks[end_mask_index] =
                    (self.masks[end_mask_index] & (std.math.boolMask(MaskInt, true) << end_bit)) |
                    (std.math.boolMask(MaskInt, value) >> ((@bitSizeOf(MaskInt) - 1) - (end_bit - 1)));
            }
        }
    }