config in args - am I doing it right?

[cprn]

It works fine, but I'm not sure I'm doing it in the right place:

null_ls.builtins.formatting.shfmt.with({
    args = {"-i", "4", "-ci", "--filename", "$FILENAME"}
}),

What if default args value changes to something different from {"-filename", "$FILENAME"}? Then my config will be broken on update. Is there a dedicated setting for (so to speak) “userspace” arguments (didn't find any in documentation)? Or can I somehow “merge” with the default args list instead?

I tried this, and it works, but IDK how safe is the assumption _opts won't change:

null_ls.builtins.formatting.shfmt.with({
    args = {"-i", "4", "-ci", table.unpack(
        null_ls.builtins.formatting.shfmt._opts.args
    )}
}),

[mochaaP]

You can do this with extra_args:

https://github.com/nvimtools/none-ls.nvim/blob/main/doc/BUILTIN_CONFIG.md#Arguments

[cprn]

I knew there must be a better way! Although, I even read that page and somehow missed it. Thank you very much!