fix(lua): replace deprecated global arg with {...} in log_debug

[mhenrixon]

Summary

• Lua's implicit arg table for variadic function arguments was removed in Lua 5.2+
• Redis 7+ and Dragonfly use newer Lua versions that error on accessing the arg global
• Changed ipairs(arg) to ipairs({...}) in log_debug, which works across all Lua versions

Closes #877

Test plan

• Lua script tests: 240 examples, 0 failures
• Full suite: 1050 examples, 0 failures

Summary by CodeRabbit

• Bug Fixes
  • Improved debug logging by fixing argument handling to ensure all debug messages correctly include the passed parameters, enhancing troubleshooting capability for internal diagnostics.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b07e678b-6ec8-4ed6-bce1-439b1937a736

📥 Commits

Reviewing files that changed from the base of the PR and between 8983b6e and 5e5bd56.

📒 Files selected for processing (1)

• lib/sidekiq_unique_jobs/lua/shared/_common.lua

📝 Walkthrough

Walkthrough

Fixed a Lua compatibility bug where the log_debug function attempted to access a nonexistent arg table. Updated the variadic argument capture mechanism to use {...} syntax, which is compatible with Lua 5.2+.

Changes

Cohort / File(s)	Summary
Lua Debug Logging Fix lib/sidekiq_unique_jobs/lua/shared/_common.lua	Updated log_debug() to capture variadic arguments via local args = {...} and iterate over it, replacing the previous undefined arg table reference. Ensures compatibility with Lua 5.2+ where the global arg was removed.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A debug log once cried out in pain,
Seeking arg in the Lua domain,
But Lua 5.2 said "that's gone away!"
So variadic {...} saved the day! ✨

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: replacing the deprecated global 'arg' with {...} in the log_debug function to fix Lua compatibility.
Linked Issues check	✅ Passed	The PR directly addresses issue #877 by implementing the exact suggested fix: replacing ipairs(arg) with ipairs{...} in log_debug for Lua 5.2+ compatibility.
Out of Scope Changes check	✅ Passed	The change is narrowly focused on fixing the specific Lua compatibility issue in log_debug; no out-of-scope modifications are present.

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