Hello,

  I did a little experiment with SIXX 0.2b (thank you, Umezawa-san!)
and found a few problems around Fraction, and also more lower-level
problem with storeString/readFrom: pair on Fraction and Complex.

  First, the following raises either ends up with an error (in a 3.8
based image) or wrong result (in 3.9):

  Fraction readFromString: (10/11) storeString.
  "or Number readFromString: (10/11) storeString."

writing and reading via SIXX doesn't work.

  For a Complex number, SIXX work because it scans the internal
structure of the number, but still the following doesn't work:

  Fraction readFromString: (1+2i) storeString.

  The following:

  Object readFromString: (10/11) storeString.

works, but I'd rather avoid using #evaluate: (I think there was some
discussion around it before) to read an interchangeable file.

  Any thoughts?

  (BTW, I'm writing a "variant" of SIXX called SISS, that files out
objects in S-expressions.  Other than the syntax, SISS produces more
"flat"-structured elements to help post processing and analysis.  That
is (getting) available in the OLPC image so please take a look at it
if you're interested in.)

-- Yoshiki