PostgreSQL 7.4.3 Documentation
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# 38.3. 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, the PL/Tcl programmer can manipulate data values as if they were just text.

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