[VER] v0.3.9-alpha

[Feat] is 操作符现在可以直接判断内置数据类型， 如 10 is Int
[Fix] evalMemberExpr的lhs可以为右值,修复原来限制为左值的BUG，如调用一个函数返回结果为struct且访问member触发此bug
[Impl] 可更换的std::dynamic_pointer_cast更换为static版本,更快！
[Feat] 增加标准库 std.time,以及用到的builtin: __ftime_now_ns，但目前 Time类有点BUG
[...] 剩下的忘了

src/Module/Library/std/time/time.fig

@@ -0,0 +1,51 @@
+/*
+    Official Module `time`
+    Library/time/time.fig
+    
+    Copyright © 2026 PuqiAR. All rights reserved.
+*/
+
+import _builtins; // provides __ftime_now_ns (int64_t)
+
+
+public struct Time
+{
+    ns: Int; // int64_t, private
+
+    public func toNanos() -> Int
+    {
+        return ns;
+    }
+
+    public func toMicros() -> Int
+    {
+        return __fvalue_int_from(ns / 1000); // convert double to int
+    }
+
+    public func toMillis() -> Double
+    {
+        return ns / 1000 / 1000;
+    }
+
+    public func toSeconds() -> Double
+    {
+        return ns / 1000 / 1000 / 1000;
+    }
+
+    public func since(other: Time) -> Int
+    {
+        const time_ns := other.toNanos();
+        const result := ns - time_ns;
+        if result < 0
+        {
+            throw "time has reversed! 😢";
+        }
+        return result;
+    }
+    // TODO: support `-` operator when Fig supports overload
+} 
+
+public func now() -> Time
+{
+    return Time{__ftime_now_ns()};
+}

src/Module/builtins.hpp

@@ -1,10 +1,12 @@
 #pragma once
 
-#include "Ast/Statements/InterfaceDefSt.hpp"
-#include "Ast/functionParameters.hpp"
+#include <Ast/Statements/InterfaceDefSt.hpp>
+#include <Ast/functionParameters.hpp>
 #include <Core/fig_string.hpp>
 #include <Value/value.hpp>
+#include <Core/runtimeTime.hpp>
 
+#include <chrono>
 #include <numeric>
 #include <unordered_map>
 #include <functional>
@@ -65,6 +67,7 @@ namespace Fig
             {u8"__fvalue_double_parse", 1},
             {u8"__fvalue_double_from", 1},
             {u8"__fvalue_string_from", 1},
+            {u8"__ftime_now_ns", 0},
             /* math start */
             {u8"__fmath_acos", 1},
             {u8"__fmath_acosh", 1},
@@ -194,6 +197,15 @@ namespace Fig
                  ObjectPtr val = args[0];
                  return std::make_shared<Object>(val->toStringIO());
              }},
+            {u8"__ftime_now_ns",
+             [](const std::vector<ObjectPtr> &args) -> ObjectPtr {
+                 // returns nanoseconds
+                 using namespace Fig::Time;
+                 auto now = Clock::now();
+                 return std::make_shared<Object>(static_cast<ValueType::IntClass>(
+                     std::chrono::duration_cast<std::chrono::nanoseconds>(now - start_time).count()));
+             }},
+
             /* math start */
             {u8"__fmath_acos",
              [](const std::vector<ObjectPtr> &args) -> ObjectPtr {