bug: invalid use of copy

[tzdybal]

In many places copy is used with nil used as destination. Because of user-friendliness of copy, this is not causing a panic (min(len(dst), len(src)) bytes are copied, and len(nil) is `0)).

Because invalid operation is used in both tests and implementation, errors were hidden.

Additionally, return value of copy is ignored.

[github-actions]

🎉 This issue has been resolved in version 0.2.3 🎉

The release is available on GitHub release

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