p("a", "b")
p(c("a", "b"), collapse = " ")
p("a", character(0))
p("a", character(0), recycle0 = TRUE)
p0("a", "b")
p0(c("a", "b"), collapse = "")
p0("a", character(0))
p0("a", character(0), recycle0 = TRUE)
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