Data Values in PL/Tcl

PostgreSQL 9.6.9 Documentation
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# 42.3. Data Values in PL/Tcl

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 a `SELECT` statement). Conversely, the `return` command 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.

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