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RE: [External] : Re: Which Elisp types are mutable?

From: Drew Adams
Subject: RE: [External] : Re: Which Elisp types are mutable?
Date: Mon, 5 Jul 2021 19:26:23 +0000

> In Emacs Lisp, typical immutable objects are symbols, keywords, numbers

We've been around this block a few times already,
and I don't really want to stir the pot here.

But I'll mention that a Lisp symbol is a kind of
mutable "object".  It has various properties, some
of which are predefined (whether or not they have
non-nil values) and any number of which others can
be created.  Predefined properties include the
symbol name, value as a variable, and value as a

All except the symbol name can be changed.  Is a
symbol something immutable?  Not IMO, but the
answer depends on what one means by "immutable".

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