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  As an exception, an explicit conditional expression with null can be used when fixing a important bug without triggering a mass rebuild.

     

       
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  If this is done a follow up pull request _should_ be created to change the code to `lib.optional(s)`.

     

       
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- Any style choices not covered here but that can be expressed as general rules should be left at the discretion of the authors of changes and _not_ commented in reviews.

     

       
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  The purpose of this is:

     

       
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   - to avoid churn as contributors with different style preferences undo each other's changes,

     

       
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   - to ensure that style rules are written down and consistent (and can thus be followed when authoring changes, reducing review cycles),

     

       
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   - and to encourage reviews to focus on more impactful considerations.

     

       
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# Practical contributing advice

     

       
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To contribute effectively and efficiently, you need to be aware of how the process generally works.