<p>I found the following snipped in the <a href="https://github.com/openstreetmap/osmosis/blob/e5d77d4c29436b458a900d509af5a01edfe88aac/osmosis-xml/src/main/java/org/openstreetmap/osmosis/xml/common/ElementWriter.java#L41">osmosis sources</a>:</p>

<div class="highlight highlight-source-java"><pre><span class="pl-c1">XML_ENCODING</span><span class="pl-k">.</span>put(<span class="pl-k">new</span> <span class="pl-smi">Character</span>((<span class="pl-k">char</span>) 0x7F), <span class="pl-s"><span class="pl-pds">"</span><span class="pl-pds">"</span></span>);</pre></div>

<p>I guess the purpose is to replace <code>0x7f</code> by an empty string, e.g. a deliberate decision to suppress <code>0x7f</code> at least for XML output. That also explains why we can't query for <code>0x7f</code> in Overpass API - it's just not in the diff file.</p>

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