Pros and Cons of Supporting Composite Keys in `sql.in()`

It appears that there's a syntax for using IN with an array of composite keys - I just learned about row constructors, in PostgreSQL.
sql.in() currently only accepts an array of primitive but it could probably accept an array of more complex data structures representing composite keys. What would be the pros/cons of supporting this?
related: https://stackoverflow.com/a/69590967/72351
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