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> All feedback welcome. Thanks.

RC4 compiles cleanly (without warnings) on most of my C compilers.
Except with IAR Embedded Workbench 6.0 for ARM.
It looks like NULL is defined as 0, and not (void*)0.
This produces a bunch of errors like that:

Error[Pe042]: operand types are incompatible ("void *" and "int")  llex.c 59

All errors initiate at lmem.h, line 20. Instead of NULL, you should
write (void*)0.

For the same reason, Lua 5.2.0-rc4 does not compile in C++ mode neither.