Lua log files: Fix infinities

persistence.lua

@@ -13,7 +13,8 @@ end
 function lua_log_file:load()
 	-- Bytecode is blocked by the engine
 	local read = assert(loadfile(self.file_path))
-	local env = {}
+	-- math.huge is serialized to inf
+	local env = {inf = math.huge}
 	setfenv(read, env)
 	read()
 	env.R = env.R or {{}}

test.lua

@@ -196,10 +196,10 @@ local logfile = persistence.lua_log_file.new(mod.get_resource"logfile.test.lua",
 logfile:init()
 logfile.root = {}
 logfile:rewrite()
-logfile:set_root({a = 1}, {b = 2, c = 3})
+logfile:set_root({a = 1}, {b = 2, c = 3, d = _G.math.huge, e = -_G.math.huge})
 logfile:close()
 logfile:init()
-assert(table.equals(logfile.root, {[{a = 1}] = {b = 2, c = 3}}))
+assert(table.equals(logfile.root, {[{a = 1}] = {b = 2, c = 3, d = _G.math.huge, e = -_G.math.huge}}))
 
 -- in-game tests & b3d testing
 local tests = {