Fix four bugs: ForIn body dropped, step max error, setLuaVersion case, Lua52 refs#240
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Summary
Fixes four bugs found in the Prometheus Lua obfuscator codebase:
visitast.lua:142) —visitBlockresult was not assigned back tostatement.body, causing AST transformations insidefor ... inloops to be lost.step.lua:58) — Error message useddata.mininstead ofdata.max.pipeline.lua:136) — Unparser checksLuaVersion(capital L/V) butsetLuaVersionpassedluaVersion(lowercase), causing the Unparser to silently fall back to LuaU.SplitStrings.lua) — ReplacedLuaVersion.Lua52withLuaVersion.Lua51.