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These entries tell you what was added, fixed, or improved in each version as compared to the previous one. In case you haven't noticed, a version number roughly corresponds to the release date of that version in `YYYY.MM.DD[.N]' format, where `.N' goes `.2', `.3', etc. if there are multiple versions on the same day.
+2006.08.14
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+In BigUnsigned::bitXor, change allocate(b2->len) to allocate(a2->len): we should allocate enough space for the longer number, not the shorter one! Thanks to Sriram Sankararaman for pointing this out.
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2006.05.03
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I ran the sample program using valgrind and discovered a `delete s' that should be `delete [] s' and a `len++' before an `allocateAndCopy(len)' that should have been after an `allocateAndCopy(len + 1)'. I fixed both. Yay for valgrind!