LuajitError: bad light userdata pointer on aarch64

[rtsisyk]

On any test:

2017-08-24 13:20:11.808 [32673] main/106/console/unix/:/root/tarantool utils.c:923 E> LuajitError: bad light userdata pointer

[rtsisyk]

Please move to 1.8.x

[xpk]

Guys, this is a major blocker for using Tarantool on arm64. Any suggestions on how one would fix / work around this?
LuaJIT developers suggest replacing lightuserdata with FFI bindings (see LuaJIT/LuaJIT#230 and torch/torch7#1035), but not being overly familiar with C/Lua interaction and especially Tarantool internals, I'm not sure how tricky this would be and if there is a better way...