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The REGISTRYINDEX constant differs between Lua 5.4 (-1001000) and Lua 5.5 (-(INT_MAX/2 + 1000)). Detect the linked Lua version at startup and compute the correct value.
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Summary
REGISTRYINDEXvalue-1001000, Lua 5.5 uses-(INT_MAX/2 + 1000)— using the wrong value causes a segfault inlua_rawgetiTest plan