sx('1 2 "c", d') # returns c("1", "2", "c", "d")
sx('1 2 3') # returns c("1", "2", "3")
sx('1 2 "3"') # returns c("1", "2", "3")
sx('1,2|3.4') # returns c("1", "2", "3.4")
sx('01 02') # returns c("01", "02")
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