setRangeValue

        pub fn setRangeValue(self: *Self, range: Range, value: bool) void {
            assert(range.end <= bit_length);
            assert(range.start <= range.end);
            if (range.start == range.end) return;
            if (num_masks == 0) 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) >> (mask_len - 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) >> (mask_len - 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)));
                }
            }
        }