<blockquote>
<p>Is a primitive number mandatory for being jitted?</p>
</blockquote>
<p>I'd be surprised if a number is mandatory, but I'm not sure this should be part of some plugin (e.g. <code>LargeIntegers</code>).</p>
<blockquote>
<p>If yes, how to reserve/allocate one?</p>
</blockquote>
<p>Primitives 541-559 are used for SmallFloats and there's still some unused numbers after them (560 569). But I don't know how primitive numbers were reserved in the past. We might want to inform the Squeak/Pharo boards?</p>

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