[plt-scheme] linear update procedures in v4

praimon wrote:
> hello,
> srfi 1 allows, but doesn't require, its linear update procedures to be
> destructive. So I was wondering, if I use append! in a version 4 #lang scheme
> module, is it 'silently' calling the non-destructive append instead?
>   
yes
> As you can see, I'm a bit confused about the mutation-related changes
> in the latest versions of plt-scheme.
> regards,
> praimon
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