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This document usesPHP Chinese website manualRelease
The argument values supplied to a PL/Tcl function's code are simply the input arguments converted to text form (just as if they had been displayed by aSELECTstatement). Conversely, thereturncommand will accept any string that is acceptable input format for the function's declared return type. So, within the PL/Tcl function, all values are just text strings.