<p>I broke it in <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="526895202" data-permission-text="Issue title is private" data-url="https://github.com/OpenSmalltalk/opensmalltalk-vm/issues/448" data-hovercard-type="pull_request" data-hovercard-url="/OpenSmalltalk/opensmalltalk-vm/pull/448/hovercard" href="https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/448">#448</a><br>
The function signature was already BADLY inconsistent!<br>
But luckily, the erroneous 64 bits arguments did get copied into 32 bits <code>dstY</code> before my fix...<br>
I sort of broke the spell and the magic vanished ;)<br>
Brittle code = hazardous life</p>
<p>What I'm very unsure of now, is if writing at negative offset is a good idea (buffer underflow?), or if this uncovers yet another bug at upper level...<br>
If I just correct function signature, the game seems to work though...</p>

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