Check for Edge Cases

Review this code for edge cases I might have missed:

FUNCTION/CODE:
[Paste your code]

KNOWN INPUTS IT HANDLES:
- [Normal case 1]
- [Normal case 2]

EDGE CASES I'VE CONSIDERED:
- [Edge case 1]
- [Edge case 2]

Please identify:
1. Edge cases I haven't handled
2. Inputs that would cause unexpected behavior
3. Boundary conditions to test
4. How to handle each case