Code Comment Improver

Improve the comments in this code: {{code}}. Add or rewrite comments to explain the why and the non-obvious reasoning, intent, and trade-offs rather than restating what the code obviously does, document any surprising behavior, assumptions, edge cases, or workarounds and the reason for them, and remove redundant comments that just echo the code. Good comments explain what the code cannot say itself. Note the balance between under-commenting tricky logic and over-commenting obvious lines. Language: {{language}}.