<p>Since we got a new comment on this, and I wrote this before reading original date, I will post it anyway.</p>
<ul>
<li>First major one: code size, or rather binary size, you don't want it on a pcbios build with limited memory, unless you really need to. And there are still targets (ROMs) that are limited to 64Kb binaries, or in some cases even less. Virtual box for example is one such thing.</li>
<li>Another reason is compability, unless your network is "properly" configured for IPv6, and you expect IPv4 to work, then you might see issues. feel free to read the mailing list</li>
</ul>

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