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Emacs 早期历史瓜🍉的一点补充：
周末拜读了下，收益良多。稍微总结下：
- Emacs = Editor macros
- Emacs Lisp 是 Lisp2
- the namespaces for functions and ordinary values are separate
- and to call a function bound to a variable, a program must use funcall.
- Also, symbols can be used as function values.
- 支持 lexical binding 道路曲折
- defadvice vs nadvice.el
- CL VS CL-lib
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