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string(5)
string(0.5)
string(-0.5)
string(true())
string(false())
concat("titi","toto")
concat("titi","toto","tata")
starts-with("tititoto","titi")
starts-with("tititoto","to")
contains("tititototata","titi")
contains("tititototata","toto")
contains("tititototata","tata")
contains("tititototata","tita")
substring("12345",2,3)
substring("12345",2)
substring("12345",1.5,2.6)
substring("12345",0,3)
string-length("")
string-length("titi")