Hero bug deals millions of damage to bosses when sold (explanation in description)

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explanation:
In Bloons TD 6 (BTD 6), the boss "Lych" has a mechanic where it heals based on the tiers of towers sold. The healing calculation is as follows:

1. **Healing Calculation**:
- Heal = tiers * boss_hp
- Here, `tiers` is the number of tiers of the tower being sold, and `boss_hp` is the current health of the boss.

2. **Overflow Issue**:
- The game uses a 32-bit signed integer to store the heal value.
- The maximum value a 32-bit signed integer can hold is 2,147,483,647.
- If the heal value exceeds this maximum, it will overflow. In programming, when a signed integer overflows, it wraps around to a negative value due to the way integer overflow is handled in two's complement representation.

3. **Scenario Analysis**:
- *Scenario 1: Selling a Tower with 15 Tiers*
- Let's say the boss has 144 million health (144,000,000).
- You sell a tower with 15 tiers (level 14 hero).
- Calculation: heal = 15 * 144,000,000 = 2,160,000,000
- Since 2,160,000,000 exceeds 2,147,483,647 (the maximum for a 32-bit signed integer), an overflow occurs.
- After overflow, heal wraps around to a negative value, specifically -2,136,313,344.
- Final heal = -2,136,313,344 / 100 = -21,363,133.44 (approximated)
- Therefore, the boss would effectively receive damage of approximately 21.36 million hp due to the negative heal.

- *Scenario 2: Selling a Tower with 13 Tiers*
- Calculation: heal = 13 * 144,000,000 = 1,872,000,000
- 1,872,000,000 is less than 2,147,483,647, so no overflow occurs.
- Final heal = 1,872,000,000 / 100 = 18,720,000
- In this case, the boss would heal for approximately 18.72 million hp.

4. **Conclusion**:
- Selling a tower with 15 tiers causes the heal calculation to overflow a 32-bit signed integer when multiplied with the boss's health.
- The overflow results in a negative heal value, which translates to damage against the boss in the game mechanics.
- Selling a tower with 13 tiers or any lower number of tiers will not cause an overflow, and the heal value will be positive, resulting in actual healing for the boss.