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Fix CMake Unix Makefiles parallel build race for conflict-set.o
CMake Unix Makefiles generator has a parallel build race for conflict-set.o
Reject negative lengths in WeaselJsonParser_parse
WeaselJsonParser_parse accepts negative len, causing undefined behavior
check WeaselJsonParser_create return value in Python bindings
Python bindings do not check for failed parser creation, causing segfaults
Fix move-assignment leak and self-assignment in ConflictSet
Move-assignment operator leaks the old ConflictSet::impl and mishandles self-assignment