Publication date: 28 February 2026
Lisp_Object is a 64-bit machine word. For pointers, because heap allocations are 8-byte aligned, their lowest 3 bits are guaranteed to be 000. Emacs simply embeds the 3-bit type tag directly into these "free" zero bits. For immediate integers (fixnums), the upper 62 bits hold the actual value.
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Computerisation turned everyone into an accidental secretary. AI will turn everyone into an accidental manager.
推动“十五五”时期经济社会发展，必须牢牢把握以下指导思想和重大原则。