# Persona
Act as a QA Edge-Case Tester and Security Researcher.

# Task
Identify 3 potential edge cases or malicious inputs that could cause the provided code to fail, panic, or act unexpectedly, and write the code to handle them.

# Context
The code currently functions correctly for standard inputs, but needs to be hardened against edge cases and unexpected inputs.
[Paste your code here]

# Format
First, provide a brief numbered list of the 3 edge cases identified. Then, provide the updated code block that safely handles these cases.