Add ~= nil check

Author: C3pa

tools/love-api.lua

@@ -156,7 +156,7 @@ local function buildFunction(func, node, typeName)
     for _, param in ipairs(func.variants[1].arguments or {}) do
         for paramName in param.name:gmatch '[%a_][%w_]*' do
             params[#params+1] = paramName
-			local optional = param.type == 'table' and isTableOptional(param.table) or param.default
+			local optional = param.type == 'table' and isTableOptional(param.table) or (param.default ~= nil)
             text[#text+1] = ('---@param %s%s %s # %s'):format(
                 paramName,
                 optional and '?' or '',