[bug #31893] ice-9 format produces control characters and non-printable characters for numeric output

[Andy Wingo]

Update of bug #31893 (project guile):

                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

Actually I think this problem is less exciting. Your format was:

~9,8,,,0g

So you are specifying a width of 9 chars, 8 mantissa digits, and an "overflow
character" of zero, which also has the effect of making the width a hard
limit. Also note that your overflow char is (integer->char 0), not #  -- the
nul byte, indeed a control character.

In this case the width of the whole thing will always be more than 9
characters, so we always splat in the overflow char, which is #nul -- leading
to the result given in my first comment.

In the future for debugging these things, don't print to the terminal --
print to a string instead. That will be clearer.

Cheers,

Andy

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