On using brackets in `setGeneric()`

Package development
1

In Advanced R, there is a suggestion about avoiding brackets ({}) in setGeneric():

It is bad practice to use {} in the generic as it triggers a special case that is more expensive, and generally best avoided.

I wonder if anyone has any detailed rationale about this suggestion. I searched it online and could not find any references except for this line in Advanced R 2nd ed. (it is not in the first edition, where brackets are used in the setGeneric() examples).

2

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