Official ZPE/YASS documentationprint
print (mixed message1[, mixed message2, mixed message3, ..., mixed messageN]) ⇒ string
Prints a message to the standard output of the system and returns the message. It also has infinite arguments which will be joined before printing.
Strings joined using the arguments of this function will be separated by a space when they are joined together.
std_outbut as of ZPE 1.9.3 it became it's own predefined function. The result of this change is that over time these functions will diverge and become unrelated.