fix(debug.getinfo): use GMod's (f, what) base signature so value-passing resolves

[AmyJeanes]

Problem

custom/debug.getinfo.lua declares the base signature as the stock-Lua (thread, f, what) form. The base signature is what the analyzer uses when debug.getinfo is referenced as a first-class value (rather than called directly) — so passing it to pcall produces spurious diagnostics:

local ok, info = pcall(debug.getinfo, fn, "S")

resolves against fun(thread, f, what), giving:

• expected 'thread' but found 'function' (fn → thread)
• expected '(function|integer)' but found '"S"' ("S" → f)

GMod's documented signature is debug.getinfo(funcOrStackLevel, fields); the coroutine-first form is valid Lua 5.1 but not the common/documented shape.

Fix

Make the 2-arg (f, what) form the base signature and keep the thread-first forms as ---@overloads (adding a thread, integer overload so the coverage the old base provided is preserved).

Direct calls are unchanged — the function and level-0 non-nil refinements still apply, and an arbitrary integer stack level still resolves to debuglib.DebugInfo?. Only the value-passing case is corrected.

Verified against a real workspace: pcall(debug.getinfo, fn, "S") now resolves with no cast and no diagnostics.

🤖 Generated with Claude Code

Greptile Summary

The PR corrects debug.getinfo’s base annotation to use GMod’s two-argument (f, what) signature while retaining thread-first forms as overloads.

• Changes the base declaration from three parameters to two.
• Preserves function, stack-level-zero, arbitrary-integer, and thread-first typing and nullability.

Confidence Score: 5/5

The PR appears safe to merge with no actionable regressions identified.

The new base parameters retain explicit types and nullable return behavior, while the overload set continues to cover refined function, level-zero, and thread-first calls.

Important Files Changed

Filename	Overview
custom/debug.getinfo.lua	Correctly promotes the typed (f, what) form to the base signature and preserves thread-first integer coverage through an overload.

_{Reviews (1): Last reviewed commit: "fix(debug.getinfo): use GMod's (f, what)..." | Re-trigger Greptile}