Hyphens in module names & -l option

Hi there,

Commit 09f3c2372f5dbeaec9f50614a26c1b5761726a88 made the -l CLI option discard
a version suffix, if any, delimited by the LUA_IGMARK (hyphen). Howevever, that
means, module names that contain a hyphen in the name (which doesn't delimit a
version suffix), such as "lua-utf8", will now have the suffix part stripped on
import, too. For example, before the patch:

    $ lua -v
    Lua 5.4.6  Copyright (C) 1994-2023 Lua.org, PUC-Rio

    $ lua -l lua-utf8 -e 'print(_G["lua-utf8"].len("test"))'
    4

Whereas on with the patch, the module is added as "lua" to the global table,
and thus the same command now fails:

    $ lua -v
    Lua 5.4.8  Copyright (C) 1994-2025 Lua.org, PUC-Rio

    $ lua -l lua-utf8 -e 'print(_G["lua-utf8"].len("test"))'
    lua: (command line):1: attempt to index a nil value (field 'lua-utf8')
    stack traceback:
            (command line):1: in main chunk
            [C]: in ?

    $ lua -l lua-utf8 -e 'print(_G["lua"].len("test"))'     # "lua" works
    4

Now, the following alternative (and perhaps more common?) methods of importing
a module work fine with both versions:

    $ lua -l u=lua-utf8 -e 'print(u.len("test"))'
    4
    $ lua -e 'local u = require("lua-utf8"); print(u.len("test"))'
    4

So I'm wondering: were such hyphen-ated names considered with that -l behavior
change, and if not, is it a common enough use case that the patch potentially
breaks the stability promise of the 5.4 version?

Thanks,

-- 
Michal Domonkos / RPM.org / Red Hat

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