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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/2121#note_3652326297">lib/hello_ext.c</a>:
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632
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633
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<td class="new_line diff-line-num" data-linenumber="633" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
633
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="c">      <span class="n" style="color: #333333;">_gnutls_buffer_clear</span><span class="p">(</span><span class="n" style="color: #333333;">buf</span><span class="p">);</span></span>
</pre></td>
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634
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634
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="c"></span>
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<td class="old_line diff-line-num old" data-linenumber="635" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
635
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<td class="new_line diff-line-num old" data-linenumber="635" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
 
</td>
<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span class="line" data-lang="c">      <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">_gnutls_buffer_append_<span class="idiff left deletion" style="background-color: #fac5cd;">prefix</span></span><span class="p">(</span><span class="n" style="color: #333333;">buf</span><span class="p">,</span> <span class="mi" style="color: #009999;"><span class="idiff deletion" style="background-color: #fac5cd;">8</span></span><span class="p"><span class="idiff deletion" style="background-color: #fac5cd;">,</span></span><span class="idiff right deletion" style="background-color: #fac5cd;"> </span><span class="n" style="color: #333333;">recv_buf</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">htype</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #009999;">0</span><span class="p">)</span></span>
</pre></td>
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<td class="old_line diff-line-num new" data-linenumber="636" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="new_line diff-line-num new" data-linenumber="635" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
635
</td>
<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c">      <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">_gnutls_buffer_append_<span class="idiff left right addition" style="background-color: #c7f0d2;">uint8</span></span><span class="p">(</span><span class="n" style="color: #333333;">buf</span><span class="p">,</span> <span class="n" style="color: #333333;">recv_buf</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">htype</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #009999;">0</span><span class="p">)</span></span>
</pre></td>
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636
</td>
<td class="new_line diff-line-num" data-linenumber="636" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
636
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="c">              <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333333;">ret</span><span class="p">);</span></span>
</pre></td>
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<td class="old_line diff-line-num old" data-linenumber="637" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
637
</td>
<td class="new_line diff-line-num old" data-linenumber="637" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
 
</td>
<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span class="line" data-lang="c">      <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">_gnutls_buffer_append_<span class="idiff left deletion" style="background-color: #fac5cd;">prefix</span></span><span class="p"><span class="idiff deletion" style="background-color: #fac5cd;">(</span></span><span class="n" style="color: #333333;"><span class="idiff deletion" style="background-color: #fac5cd;">buf</span></span><span class="p"><span class="idiff deletion" style="background-color: #fac5cd;">,</span></span><span class="idiff deletion" style="background-color: #fac5cd;"> </span><span class="mi" style="color: #009999;"><span class="idiff deletion" style="background-color: #fac5cd;">24</span></span><span class="p"><span class="idiff right deletion" style="background-color: #fac5cd;">,</span></span></span>
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638
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<td class="new_line diff-line-num old" data-linenumber="637" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
 
</td>
<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span class="line" data-lang="c">      <span class="idiff left deletion" style="background-color: #fac5cd;">                                 </span><span class="n" style="color: #333333;"><span class="idiff deletion" style="background-color: #fac5cd;">recv_buf</span></span><span class="o" style="font-weight: 600;"><span class="idiff deletion" style="background-color: #fac5cd;">-></span></span><span class="n" style="color: #333333;"><span class="idiff deletion" style="background-color: #fac5cd;">data</span></span><span class="p"><span class="idiff deletion" style="background-color: #fac5cd;">.</span></span><span class="n" style="color: #333333;"><span class="idiff deletion" style="background-color: #fac5cd;">length</span></span><span class="p"><span class="idiff deletion" style="background-color: #fac5cd;">))</span></span><span class="idiff deletion" style="background-color: #fac5cd;"> </span><span class="o" style="font-weight: 600;"><span class="idiff right deletion" style="background-color: #fac5cd;"><</span></span> <span class="mi" style="color: #009999;">0</span><span class="p">)</span></span>
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<td class="old_line diff-line-num new" data-linenumber="639" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
 
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<td class="new_line diff-line-num new" data-linenumber="637" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
637
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c">      <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">_gnutls_buffer_append_<span class="idiff left addition" style="background-color: #c7f0d2;">uint24</span></span><span class="p"><span class="idiff addition" style="background-color: #c7f0d2;">(</span></span><span class="n" style="color: #333333;"><span class="idiff addition" style="background-color: #c7f0d2;">buf</span></span><span class="p"><span class="idiff addition" style="background-color: #c7f0d2;">,</span></span><span class="idiff addition" style="background-color: #c7f0d2;"> </span><span class="n" style="color: #333333;"><span class="idiff addition" style="background-color: #c7f0d2;">recv_buf</span></span><span class="o" style="font-weight: 600;"><span class="idiff addition" style="background-color: #c7f0d2;">-></span></span><span class="n" style="color: #333333;"><span class="idiff addition" style="background-color: #c7f0d2;">data</span></span><span class="p"><span class="idiff addition" style="background-color: #c7f0d2;">.</span></span><span class="n" style="color: #333333;"><span class="idiff addition" style="background-color: #c7f0d2;">length</span></span><span class="p"><span class="idiff addition" style="background-color: #c7f0d2;">))</span></span><span class="idiff addition" style="background-color: #c7f0d2;"> </span><span class="o" style="font-weight: 600;"><span class="idiff right addition" style="background-color: #c7f0d2;"><</span></span></span>
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638
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c">      <span class="idiff left right addition" style="background-color: #c7f0d2;">   </span> <span class="mi" style="color: #009999;">0</span><span class="p">)</span></span>
</pre></td>
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="c">              <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333333;">ret</span><span class="p">);</span></span>
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<td class="old_line diff-line-num" data-linenumber="640" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
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<td class="new_line diff-line-num" data-linenumber="640" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="c">      <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">_gnutls_buffer_append_data</span><span class="p">(</span><span class="n" style="color: #333333;">buf</span><span class="p">,</span> <span class="n" style="color: #333333;">recv_buf</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">data</span><span class="p">.</span><span class="n" style="color: #333333;">data</span><span class="p">,</span></span>
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<td class="old_line diff-line-num" data-linenumber="641" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
641
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<td class="new_line diff-line-num" data-linenumber="641" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
641
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="c">                                            <span class="n" style="color: #333333;">recv_buf</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">data</span><span class="p">.</span><span class="n" style="color: #333333;">length</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #009999;">0</span><span class="p">)</span></span>
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<td class="old_line diff-line-num" data-linenumber="642" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
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<td class="new_line diff-line-num" data-linenumber="642" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
642
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="c">              <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333333;">ret</span><span class="p">);</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">That's tricky. For the "pop" functions, <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>_gnutls_buffer_pop_uint*</code> are preferred over the previous <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>_gnutls_buffer_pop_prefix</code> (with the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>size_t *</code> argument) for type-safety, because GCC will warn if the value read does not fit in the given <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>uint*_t *</code> parameter.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">On the other hand, for the "append" functions, it is legitimate to pass a <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>uint32_t</code> as a <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>uint8_t</code> argument, so even if we eliminate the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>_gnutls_buffer_append_prefix</code> function, there are still issues with truncation.</p>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">I guess a reasonable middle ground is to make <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>_gnutls_buffer_append_uint*</code> to take <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>size_t</code>, but with a run-time check whether it fits in the expected type.</p>
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