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Adds a new second argument, `where`, a string which indicates places
to search for the module.
If `where` contains "l", it will search using the LuaRocks loader; if it
contains "p", it will look in the filesystem using package.path and
package.cpath. You can use both at the same time.
If successful, it will return four values.
* If found using the LuaRocks loader, it will return:
* filename of the module (eg. "/usr/local/lib/lua/5.1/socket/core.so"),
* rock name
* rock version
* "l" to indicate the match comes from the loader.
* If found scanning package.path and package.cpath, it will return:
* filename of the module (eg. "/usr/local/lib/lua/5.1/socket/core.so"),
* "path" or "cpath"
* nil
* "p" to indicate the match comes from scanning package.path and cpath.
If unsuccessful, nothing is returned.
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