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Spreadsheet Excel Writer
This package is a port of a perl package.
It is unmaintained (and nigh on unmaintainable), and out of sync with the original perl package, so results in a significant amount of bugs.
The original lives at CPAN.
The PEAR code is translated from a really old version of the original, about 12 releases have since taken place.
There is no version control of the original, so it's hard to even see the small changes and just apply those
How would we go about testing
One idea to catch regressions is to install a copy of the PERL version, and write tests against both.
Expect the perl version to render correctly.
The problem with this is the fragility involved.