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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 <code class="command">SELECT</code> statement). Conversely, the
<code class="literal">return</code> and <code class="literal">return_next</code> commands will accept
any string that is acceptable input format for the function's declared
result type, or for the specified column of a composite result type.
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