and (unquote-splicing <expression> ...)?

In other words, more than one argument to UNQUOTE(-SPLICING).

These were added in R6RS to fix some well-known shortcomings of quasiquote.
The issue and the R6RS solution had been known for a long time and were
discussed by many authors for many years before being adopted.
I for one liked the change and probably have code that depends on it.

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