diff --git a/changelog.md b/changelog.md
index 2ed89e280..69a71f25d 100644
--- a/changelog.md
+++ b/changelog.md
@@ -8,6 +8,8 @@
 * `FIX` Prevent class methods from triggering missing-fields diagnostics
 * `ADD` missing locale
 * `FIX` updates the EmmyLuaCodeStyle submodule reference to a newer commit, ensuring compatibility with GCC 15
+* `FIX` large unions will no longer erroneously fail to match later variants
+* `ADD` Lua.type.maxUnionVariants which can be set to limit how many union variants are checked against
 
 ## 3.14.0
 `2025年4月7日`
diff --git a/script/config/template.lua b/script/config/template.lua
index b59911599..150dcf50f 100644
--- a/script/config/template.lua
+++ b/script/config/template.lua
@@ -401,6 +401,7 @@ local template = {
 ['Lua.language.completeAnnotation'] = Type.Boolean>> true,
 ['Lua.type.castNumberToInteger'] = Type.Boolean>> true,
 ['Lua.type.weakUnionCheck'] = Type.Boolean>> false,
+ ['Lua.type.maxUnionVariants'] = Type.Integer>> 0,
 ['Lua.type.weakNilCheck'] = Type.Boolean>> false,
 ['Lua.type.inferParamType'] = Type.Boolean>> false,
 ['Lua.type.checkTableShape'] = Type.Boolean>> false,
diff --git a/script/vm/type.lua b/script/vm/type.lua
index 24f095a01..d8d272016 100644
--- a/script/vm/type.lua
+++ b/script/vm/type.lua
@@ -374,10 +374,11 @@ function vm.isSubType(uri, child, parent, mark, errs)
 elseif child.type == 'vm.node' then
 if config.get(uri, 'Lua.type.weakUnionCheck') then
 local hasKnownType = 0
+ local maxUnionVariants = config.get(uri, 'Lua.type.maxUnionVariants') or 0
 local i = 0
 for n in child:eachObject() do
 i = i + 1
- if i> 100 then
+ if maxUnionVariants> 0 and i> maxUnionVariants then
 break
 end
 if vm.getNodeName(n) then
@@ -403,10 +404,11 @@ function vm.isSubType(uri, child, parent, mark, errs)
 else
 local weakNil = config.get(uri, 'Lua.type.weakNilCheck')
 local skipTable
+ local maxUnionVariants = config.get(uri, 'Lua.type.maxUnionVariants') or 0
 local i = 0
 for n in child:eachObject() do
 i = i + 1
- if i> 100 then
+ if maxUnionVariants> 0 and i> maxUnionVariants then
 break
 end
 if skipTable == nil and n.type == "table" and parent.type == "vm.node" then -- skip table type check if child has class
@@ -473,10 +475,11 @@ function vm.isSubType(uri, child, parent, mark, errs)
 parent = global
 elseif parent.type == 'vm.node' then
 local hasKnownType = 0
+ local maxUnionVariants = config.get(uri, 'Lua.type.maxUnionVariants') or 0
 local i = 0
 for n in parent:eachObject() do
 i = i + 1
- if i> 100 then
+ if maxUnionVariants> 0 and i> maxUnionVariants then
 break
 end
 if vm.getNodeName(n) then
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/LuaLS/lua-language-server/pull/3208.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://patch-diff.githubusercontent.com/raw/LuaLS/lua-language-server/pull/3208.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>