/usr/share/lua/5.1/pl/init.lua is in lua-penlight 1.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Entry point for loading all PL libraries only on demand, into the global space.
-- Requiring 'pl' means that whenever a module is implicitly accesssed
-- (e.g. `utils.split`)
-- then that module is dynamically loaded. The submodules are all brought into
-- the global space.
--Updated to use pl.import_into
-- @module pl
require'pl.import_into'(_G)
if rawget(_G,'PENLIGHT_STRICT') then require 'pl.strict' end
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