Autoconf 2.66 added '+' to the set of allowed characters in --enable-*

Why?

    So, my question is: could standards.texi document the set of allowed
    characters?

Can you make a proposal?

    Current Autoconf has -+. mapped to _ and otherwise wants characters
    eligible for shell variable names; but you may want to just allow more
    of them?

What's the advantage of allowing more characters?

Thanks,
k

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