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Re: new function or modify read
> Marc> (parameterize ((write-shared #t)
> Marc> (write-radix 16)
> Marc> (write-prettily #t))
> Marc> (write X))
> Except your old code doesn't know anything about the presence of all
> these flags. In fact, every new feature controlled via these
> parameters might break the old code.
Could you explain why? I explicitly said: "But this will not happen
if you code your calls to write in this style: ...", meaning that only
"write" is in the scope of the parameterize. There is no old code
affected by the parameterize!