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prxnvt
113aeff07c
A Python part whose zip entry failed to read (a bad checksum or compressed stream) made the whole workbook fail to open: the error was passed up, and the failed read had also ended the package's read budget, so even a warning would have left the sheets unread. The part is now read with Package::read_optional_limited, which charges a failed read only that part's allowance, and every error other than TooLarge is a warning. The Python cells then keep only their cached values, as when the part is missing. Malformed XML in the part was already a warning; the test covers it too.