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First release of the 3.1.x series. This is taken from the "64bithash" branch.
- Adds support for -B values greater than 2GB, enabled by -DXD3_USE_LARGESIZET=1 variable
- Adds new performance and speed regression test (written in #Golang)
When compiled for large sizes, xdelta3 uses a 64bit checksum function. This impacts both compression and speed.
Relative to 3.0.11, the new branch is currently 3-5% slower and has 1-2% worse compression. Performance will be addressed in future 3.1.x releases.