🧹 update: replace UnsafeBytes util with suggested way

[efectn]

Description

Fixes #2180
This is also 2 ns/op faster than old way.

Type of change

• Just an update.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes
• I tried to make my code as fast as possible with as few allocations as possible

Commit formatting:

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