diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 86284d74..e6a01255 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,7 +20,7 @@ jobs:
   unix:
     strategy:
       matrix:
-        os: [{name: ubuntu, version: ubuntu-latest}, {name: macos, version: macos-latest}]
+        os: [{name: ubuntu, version: ubuntu-latest}, {name: macos, version: macos-latest}, {name: macos-arm, version: macos-14}]
     name: ${{matrix.os.name}}
     runs-on: ${{matrix.os.version}}
     steps:
diff --git a/Analysis/src/Autocomplete.cpp b/Analysis/src/Autocomplete.cpp
index 75fd9f58..87a593bd 100644
--- a/Analysis/src/Autocomplete.cpp
+++ b/Analysis/src/Autocomplete.cpp
@@ -16,6 +16,7 @@
 LUAU_FASTFLAG(DebugLuauDeferredConstraintResolution);
 LUAU_FASTFLAG(DebugLuauReadWriteProperties);
 LUAU_FASTFLAGVARIABLE(LuauAutocompleteStringLiteralBounds, false);
+LUAU_FASTFLAGVARIABLE(LuauAutocompleteTableKeysNoInitialCharacter, false);
 
 static const std::unordered_set<std::string> kStatementStartingKeywords = {
     "while", "if", "local", "repeat", "function", "do", "for", "return", "break", "continue", "type", "export"};
@@ -1742,6 +1743,37 @@ static AutocompleteResult autocomplete(const SourceModule& sourceModule, const M
             }
         }
     }
+    else if (AstExprTable* exprTable = node->as<AstExprTable>(); exprTable && FFlag::LuauAutocompleteTableKeysNoInitialCharacter)
+    {
+        AutocompleteEntryMap result;
+
+        if (auto it = module->astExpectedTypes.find(exprTable))
+        {
+            result = autocompleteProps(*module, typeArena, builtinTypes, *it, PropIndexType::Key, ancestry);
+
+            // If the key type is a union of singleton strings,
+            // suggest those too.
+            if (auto ttv = get<TableType>(follow(*it)); ttv && ttv->indexer)
+            {
+                autocompleteStringSingleton(ttv->indexer->indexType, false, node, position, result);
+            }
+
+            // Remove keys that are already completed
+            for (const auto& item : exprTable->items)
+            {
+                if (!item.key)
+                    continue;
+
+                if (auto stringKey = item.key->as<AstExprConstantString>())
+                    result.erase(std::string(stringKey->value.data, stringKey->value.size));
+            }
+        }
+
+        // Also offer general expression suggestions
+        autocompleteExpression(sourceModule, *module, builtinTypes, typeArena, ancestry, position, result);
+
+        return {result, ancestry, AutocompleteContext::Property};
+    }
     else if (isIdentifier(node) && (parent->is<AstStatExpr>() || parent->is<AstStatError>()))
         return {autocompleteStatement(sourceModule, *module, ancestry, position), ancestry, AutocompleteContext::Statement};
 
diff --git a/VM/src/linit.cpp b/VM/src/linit.cpp
index b7491952..d2176a97 100644
--- a/VM/src/linit.cpp
+++ b/VM/src/linit.cpp
@@ -43,9 +43,13 @@ void luaL_sandbox(lua_State* L)
 
     // set all builtin metatables to read-only
     lua_pushliteral(L, "");
-    lua_getmetatable(L, -1);
-    lua_setreadonly(L, -1, true);
-    lua_pop(L, 2);
+    if (lua_getmetatable(L, -1))
+    {
+        lua_setreadonly(L, -1, true);
+        lua_pop(L, 2);
+    }
+    else
+        lua_pop(L, 1);
 
     // set globals to readonly and activate safeenv since the env is immutable
     lua_setreadonly(L, LUA_GLOBALSINDEX, true);
diff --git a/tests/Autocomplete.test.cpp b/tests/Autocomplete.test.cpp
index 8bed89cd..5b031e79 100644
--- a/tests/Autocomplete.test.cpp
+++ b/tests/Autocomplete.test.cpp
@@ -16,6 +16,7 @@
 LUAU_FASTFLAG(LuauTraceTypesInNonstrictMode2)
 LUAU_FASTFLAG(LuauSetMetatableDoesNotTimeTravel)
 LUAU_FASTFLAG(LuauAutocompleteStringLiteralBounds);
+LUAU_FASTFLAG(LuauAutocompleteTableKeysNoInitialCharacter)
 
 using namespace Luau;
 
@@ -2693,6 +2694,43 @@ local t = {
     CHECK_EQ(ac.context, AutocompleteContext::Property);
 }
 
+TEST_CASE_FIXTURE(ACFixture, "suggest_table_keys_no_initial_character")
+{
+    ScopedFastFlag sff{FFlag::LuauAutocompleteTableKeysNoInitialCharacter, true};
+
+    check(R"(
+type Test = { first: number, second: number }
+local t: Test = { @1 }
+    )");
+
+    auto ac = autocomplete('1');
+    CHECK(ac.entryMap.count("first"));
+    CHECK(ac.entryMap.count("second"));
+    CHECK_EQ(ac.context, AutocompleteContext::Property);
+
+    check(R"(
+type Test = { first: number, second: number }
+local t: Test = { first = 1, @1 }
+    )");
+
+    ac = autocomplete('1');
+    CHECK_EQ(ac.entryMap.count("first"), 0);
+    CHECK(ac.entryMap.count("second"));
+    CHECK_EQ(ac.context, AutocompleteContext::Property);
+
+    check(R"(
+type Properties = { TextScaled: boolean, Text: string }
+local function create(props: Properties) end
+
+create({ @1 })
+    )");
+
+    ac = autocomplete('1');
+    CHECK(ac.entryMap.count("TextScaled"));
+    CHECK(ac.entryMap.count("Text"));
+    CHECK_EQ(ac.context, AutocompleteContext::Property);
+}
+
 TEST_CASE_FIXTURE(ACFixture, "autocomplete_documentation_symbols")
 {
     loadDefinition(R"(
diff --git a/tests/Conformance.test.cpp b/tests/Conformance.test.cpp
index 2d6a5ac7..298c5322 100644
--- a/tests/Conformance.test.cpp
+++ b/tests/Conformance.test.cpp
@@ -884,6 +884,17 @@ TEST_CASE("NewUserdataOverflow")
     CHECK(strcmp(lua_tostring(L, -1), "memory allocation error: block too big") == 0);
 }
 
+TEST_CASE("SandboxWithoutLibs")
+{
+    StateRef globalState(luaL_newstate(), lua_close);
+    lua_State* L = globalState.get();
+
+    luaopen_base(L); // Load only base library
+    luaL_sandbox(L);
+
+    CHECK(lua_getreadonly(L, LUA_GLOBALSINDEX));
+}
+
 TEST_CASE("ApiTables")
 {
     StateRef globalState(luaL_newstate(), lua_close);