Lua value(s) returned by the code block converted to R object(s).
Only a subset of all Lua types can be converted to R objects at present.
If multiple values are returned, these are packaged in a list.
Arguments
code
Lua code block to run.
filename
If non-NULL, name of file to run.
L
Lua state in which to run the code. NULL (default)
uses the default Lua state for luajr.