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<code class="function">to_string</code>. It is used by eg.
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<code class="function">result::field::to()</code> to convert the incoming
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field data (which is in text format) to the desired C++ type.
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doing this at various levels of reliability, called
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<code class="literal">nontransaction</code>, <code class="literal">transaction</code>,
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and <code class="literal">robusttransaction</code> for no, standard, and
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best reliability respectively.
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