Lua 5.3 unable to convert cdata to string

[Strasser-Pablo]

Using RandomKit with lua 5.3 generate this error in file randomkit/wrapC.lua:193.
when executed in the following file:
require 'randomkit' torch.getRNGState()
Changing line 193 from:
'local clonedState = ffi.string(randomkit._state, ffi.sizeof(randomkit._state))'
to
local clonedState = randomkit._state, ffi.sizeof(randomkit._state)
correct the problem however I have no idea of the implication of the change on other system and other lua system.