Re: frames vs. weak hash tables and garbage collection

[Richard Stallman]

    But it seems that `values' is never flushed, so it is a source of leaks.
    We should probably fix it (I'd remove it since almost noone even knows that
    it exists, but I guess Richard uses it once in a blue moon).

I don't use it myself.  I put it in because a history of values
is a useful thing for any read-eval-print loop.  We could delete it,
but it might be better to do more to inform people about it.
For instance, mention it in the text in the *scratch* buffer.

Then they might indeed find it useful.  Or if they don't,
we could delete it.

I agree with the suggestion to truncate it to a specified maximum
length.  How about 40?