d when the field is declared. Field tags are optional, the default value of each field tag is a blank string. The syntax allows either string literal forms for field tags. However, in practice, struct filed tags should present as key-value pairs, and each tag should present as raw string literals (...), whereas each value in a tag should present as interpreted string literals (<code class="tmd-code-span">"..."</code>). For example:
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<pre class="tmd-code line-numbers">
<code class="language-go"