feat: Date 严格 ISO 解析与 6 位年字符串输出

Cargo.lock

@@ -1160,7 +1160,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_builtins"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "chrono",
  "fast-float",
@@ -1185,7 +1185,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_bytecode"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "num-bigint",
  "oxide_log",
@@ -1193,7 +1193,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_cfg"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_emit",
@@ -1204,7 +1204,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_cli"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "ansi_term",
  "bumpalo",
@@ -1228,7 +1228,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_code_cache"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "lru",
  "oxide_bytecode",
@@ -1237,7 +1237,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_compiler"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1258,7 +1258,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_dce"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1272,7 +1272,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_emit"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "num-bigint",
  "oxc_allocator",
@@ -1288,7 +1288,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_engine"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_compiler",
@@ -1300,7 +1300,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_fold"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "num-bigint",
  "oxide_bytecode",
@@ -1312,7 +1312,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_ir"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_log",
@@ -1321,7 +1321,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_kernel"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "bumpalo",
  "dashmap",
@@ -1335,7 +1335,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_liveness"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1347,7 +1347,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_log"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "tracing",
  "tracing-appender",
@@ -1356,11 +1356,11 @@ dependencies = [
 
 [[package]]
 name = "oxide_net"
-version = "0.19.16"
+version = "0.19.17"
 
 [[package]]
 name = "oxide_parser"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxc_allocator",
  "oxc_ast",
@@ -1375,7 +1375,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_regalloc"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1391,7 +1391,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_runtime_api"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "num-bigint",
  "num-traits",
@@ -1404,7 +1404,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_test262"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "oxide_bytecode",
  "oxide_compiler",
@@ -1424,7 +1424,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_types"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "bumpalo",
  "dashmap",
@@ -1437,7 +1437,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_vm"
-version = "0.19.16"
+version = "0.19.17"
 dependencies = [
  "bumpalo",
  "chrono",

Cargo.toml

@@ -25,7 +25,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.19.16"
+version = "0.19.17"
 edition = "2021"
 license = "MIT"
 rust-version = "1.80"

crates/oxide_builtins/src/number.rs

@@ -1,6 +1,6 @@
 use oxide_types::value::JsValue;
 
-use oxide_runtime_api::{NativeResult, ProtoKind, VmHost};
+use oxide_runtime_api::{NativeResult, ProtoKind, ToPrimitiveHint, VmHost};
 
 /// 整值且 i32 域内的有限数转 int 表示；-0 排除
 /// （int 表示丢符号，规范要求 `Number(-0)` 得 -0）。
@@ -23,7 +23,7 @@ pub fn number_constructor<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
         // ToPrimitive 先解盒：BigInt 原始值走 lossy 转换（BigIntToNumber 不抛错，
         // 显式 `Number(bigint)` 是规范唯一合法入口）；其余经 bounded ToNumber
         // 入口（Symbol 抛 TypeError）。
-        let prim = match vm.coerce_primitive_bounded(raw, false) {
+        let prim = match vm.coerce_primitive_bounded(raw, ToPrimitiveHint::Number) {
             Ok(p) => p,
             Err(_) => {
                 // 对象经 ToPrimitive 转换时 toString/valueOf 可抛异常，须原样传播原始异常。

crates/oxide_runtime_api/src/coercion.rs

@@ -543,7 +543,7 @@ pub fn abstract_eq<H: VmHost>(lhs: JsValue, rhs: JsValue, host: &mut H) -> Resul
             } else {
                 rhs
             };
-            let prim = to_primitive(lhs, ToPrimitiveHint::Default, host)?;
+            let prim = to_primitive(lhs, ToPrimitiveHint::Number, host)?;
             abstract_eq(prim, rhs, host)
         }
         (
@@ -556,7 +556,7 @@ pub fn abstract_eq<H: VmHost>(lhs: JsValue, rhs: JsValue, host: &mut H) -> Resul
             } else {
                 lhs
             };
-            let prim = to_primitive(rhs, ToPrimitiveHint::Default, host)?;
+            let prim = to_primitive(rhs, ToPrimitiveHint::Number, host)?;
             abstract_eq(lhs, prim, host)
         }
         // 其余组合不相等（含 null/undefined 与其它类型；Object/Object 已由同类型分支处理）。
@@ -872,13 +872,22 @@ pub enum ToPrimitiveHint {
 }
 
 impl ToPrimitiveHint {
-    /// OrdinaryToPrimitive 方法名顺序提示：`Default`/`Number` → "number"，`String` → "string"。
+    /// 传给 `@@toPrimitive` 的 hint 字符串：`String` → "string"，`Default` → "default"，
+    /// `Number` → "number"。
     pub fn as_str(self) -> &'static str {
         match self {
             ToPrimitiveHint::String => "string",
-            ToPrimitiveHint::Default | ToPrimitiveHint::Number => "number",
+            ToPrimitiveHint::Default => "default",
+            ToPrimitiveHint::Number => "number",
         }
     }
+
+    /// OrdinaryToPrimitive 回退方法序：`String` 先试 `toString`，
+    /// `Default`/`Number` 先试 `valueOf`。
+    #[inline]
+    pub fn prefer_string(self) -> bool {
+        self == ToPrimitiveHint::String
+    }
 }
 
 /// ToPrimitive(input, hint) per ECMA-262 §7.1.1.
@@ -890,7 +899,7 @@ pub fn to_primitive<H: VmHost>(val: JsValue, hint: ToPrimitiveHint, host: &mut H
     if !val.is_object() {
         return Ok(val);
     }
-    host.coerce_primitive_bounded(val, hint == ToPrimitiveHint::String)
+    host.coerce_primitive_bounded(val, hint)
 }
 
 /// 带完整对象强制转换的 ToNumber(input)：对象经 ToPrimitive（number hint）

crates/oxide_runtime_api/src/host.rs

@@ -311,7 +311,9 @@ pub trait VmHost {
 
     // 查找 / 强制转换
     fn lookup_str(&self, val: JsValue) -> Option<String>;
-    fn coerce_primitive_bounded(&mut self, value: JsValue, prefer_string: bool) -> Result<JsValue, String>;
+    fn coerce_primitive_bounded(
+        &mut self, value: JsValue, hint: crate::ToPrimitiveHint,
+    ) -> Result<JsValue, String>;
     fn coerce_number_bounded(&mut self, value: JsValue) -> Result<f64, String>;
 
     // 调用基础设施

crates/oxide_vm/src/dispatch/arithmetic.rs

@@ -108,8 +108,8 @@ impl Vm {
         // 注意：不能在此前置检查 BigInt 混合（`lv.is_bigint() || rv.is_bigint()`）——
         // 对象操作数（如 `{valueOf: () => 2n}`）需先 ToPrimitive 再判定，混合检查
         // 必须放在 coerce 之后。
-        let lhs = self.coerce_primitive_bounded(lv, false)?;
+        let lhs = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-        let rhs = self.coerce_primitive_bounded(rv, false)?;
+        let rhs = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         reject_symbol_add!(self, lhs, rhs);
         if lhs.is_string() || rhs.is_string() {
             self.regs[rd] = self.concat_strings(lhs, rhs);
@@ -238,8 +238,8 @@ impl Vm {
             }
             // 快路径失败才 coerce：acc 已原语零副作用；next 对象 ToPrimitive 在此触发，
             // 顺序与左结合 ADD 一致。
-            let lhs = self.coerce_primitive_bounded(acc, false)?;
+            let lhs = self.coerce_primitive_bounded(acc, coercion::ToPrimitiveHint::Number)?;
-            let rhs = self.coerce_primitive_bounded(next, false)?;
+            let rhs = self.coerce_primitive_bounded(next, coercion::ToPrimitiveHint::Number)?;
             reject_symbol_add!(self, lhs, rhs);
             if lhs.is_string() || rhs.is_string() {
                 // ── 阶段 2：字符串模式单趟预分配 ──
@@ -280,7 +280,7 @@ impl Vm {
         parts.push(rhs);
         for &reg in rest {
             let v = self.regs[reg];
-            let prim = if v.is_object() { self.coerce_primitive_bounded(v, false)? } else { v };
+            let prim = if v.is_object() { self.coerce_primitive_bounded(v, coercion::ToPrimitiveHint::Number)? } else { v };
             // 字符串模式对全部操作数做 ToString，Symbol 按 §7.1.17 抛 TypeError。
             if prim.is_symbol() {
                 self.raise_type_error("Cannot convert a Symbol value to a string")?;
@@ -322,7 +322,7 @@ impl Vm {
         let v = self.regs[a];
         // ToPrimitive 先解盒（BigInt 包装对象如 Object(1n) 的 valueOf 返回 BigInt），
         // 解盒后是 BigInt 才抛 TypeError——用户覆盖 valueOf/toString 的普通对象不受影响。
-        let prim = self.coerce_primitive_bounded(v, false)?;
+        let prim = self.coerce_primitive_bounded(v, coercion::ToPrimitiveHint::Number)?;
         if prim.is_bigint() {
             return self.raise_type_error("Cannot convert a BigInt value to a number");
         }
@@ -348,8 +348,8 @@ impl Vm {
             self.regs[rd] = self.new_bigint(self.bigint_value(lv) + self.bigint_value(rv));
             return Ok(());
         }
-        let lhs = self.coerce_primitive_bounded(lv, false)?;
+        let lhs = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-        let rhs = self.coerce_primitive_bounded(rv, false)?;
+        let rhs = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         reject_symbol_add!(self, lhs, rhs);
         if lhs.is_string() || rhs.is_string() {
             self.regs[rd] = self.concat_strings(lhs, rhs);
@@ -387,8 +387,8 @@ impl Vm {
             self.regs[rd] = self.new_bigint(self.bigint_value(lv) - self.bigint_value(rv));
             return Ok(());
         }
-        let l = self.coerce_primitive_bounded(lv, false)?;
+        let l = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-        let r = self.coerce_primitive_bounded(rv, false)?;
+        let r = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         reject_symbol_number!(self, l, r);
         if l.is_bigint() && r.is_bigint() {
             self.regs[rd] = self.new_bigint(self.bigint_value(l) - self.bigint_value(r));
@@ -420,8 +420,8 @@ impl Vm {
             self.regs[rd] = self.new_bigint(self.bigint_value(lv) * self.bigint_value(rv));
             return Ok(());
         }
-        let l = self.coerce_primitive_bounded(lv, false)?;
+        let l = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-        let r = self.coerce_primitive_bounded(rv, false)?;
+        let r = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         reject_symbol_number!(self, l, r);
         if l.is_bigint() && r.is_bigint() {
             self.regs[rd] = self.new_bigint(self.bigint_value(l) * self.bigint_value(r));
@@ -457,8 +457,8 @@ impl Vm {
             self.regs[rd] = self.new_bigint(self.bigint_value(lv) / r);
             return Ok(());
         }
-        let l = self.coerce_primitive_bounded(lv, false)?;
+        let l = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-        let r = self.coerce_primitive_bounded(rv, false)?;
+        let r = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         reject_symbol_number!(self, l, r);
         if l.is_bigint() && r.is_bigint() {
             let rv = self.bigint_value(r);
@@ -506,8 +506,8 @@ impl Vm {
             self.regs[rd] = self.new_bigint(self.bigint_value(lv) % r);
             return Ok(());
         }
-        let l = self.coerce_primitive_bounded(lv, false)?;
+        let l = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-        let r = self.coerce_primitive_bounded(rv, false)?;
+        let r = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         reject_symbol_number!(self, l, r);
         if l.is_bigint() && r.is_bigint() {
             let rv = self.bigint_value(r);
@@ -551,8 +551,8 @@ impl Vm {
             let exp = self.bigint_value(rv).clone();
             return self.bigint_exp(&base, &exp);
         }
-        let l = self.coerce_primitive_bounded(lv, false)?;
+        let l = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-        let r = self.coerce_primitive_bounded(rv, false)?;
+        let r = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         if l.is_symbol() || r.is_symbol() {
             self.raise_type_error("Cannot convert a Symbol value to a number")?;
             return Ok(JsValue::undefined());

crates/oxide_vm/src/dispatch/bitwise.rs

@@ -2,6 +2,7 @@ use crate::vm::Vm;
 use crate::vm_trace;
 use num_bigint::{BigInt, Sign};
 use num_traits::ToPrimitive;
+use oxide_runtime_api as coercion;
 use oxide_types::value::JsValue;
 
 impl Vm {
@@ -19,13 +20,13 @@ impl Vm {
     #[inline(always)]
     fn coerce_primitive_pair(&mut self, lv: JsValue, rv: JsValue) -> Result<(JsValue, JsValue), String> {
         let saved_pc = self.pc;
-        let l = self.coerce_primitive_bounded(lv, false)?;
+        let l = self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
         if self.pc != saved_pc {
             // 转换异常已被外围 try/catch 接住：unwind 已改写 pc，立即中止后续转换，
             // 由调用方在检测到 pc 变化后直接返回，避免继续用 undefined 计算结果并二次抛错。
             return Ok((JsValue::undefined(), JsValue::undefined()));
         }
-        let r = self.coerce_primitive_bounded(rv, false)?;
+        let r = self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
         if self.pc != saved_pc {
             return Ok((JsValue::undefined(), JsValue::undefined()));
         }
@@ -183,7 +184,7 @@ impl Vm {
     pub(crate) fn dispatch_bit_not(&mut self, rd: usize, a: usize) -> Result<(), String> {
         vm_trace!("BIT_NOT rd={} r{}", rd, a);
         let saved_pc = self.pc;
-        let v = self.coerce_primitive_bounded(self.regs[a], false)?;
+        let v = self.coerce_primitive_bounded(self.regs[a], coercion::ToPrimitiveHint::Number)?;
         if self.pc != saved_pc {
             return Ok(());
         }

crates/oxide_vm/src/dispatch/comparison.rs

@@ -27,8 +27,8 @@ impl Vm {
     #[inline(always)]
     pub(crate) fn dispatch_lt(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
         vm_trace!("LT rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
-        let va = self.coerce_primitive_bounded(self.regs[a], false)?;
+        let va = self.coerce_primitive_bounded(self.regs[a], coercion::ToPrimitiveHint::Number)?;
-        let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
+        let vb = self.coerce_primitive_bounded(self.regs[b], coercion::ToPrimitiveHint::Number)?;
         if va.is_symbol() || vb.is_symbol() {
             return self.raise_type_error("Cannot convert a Symbol value to a number");
         }
@@ -45,8 +45,8 @@ impl Vm {
     #[inline(always)]
     pub(crate) fn dispatch_gt(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
         vm_trace!("GT rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
-        let va = self.coerce_primitive_bounded(self.regs[a], false)?;
+        let va = self.coerce_primitive_bounded(self.regs[a], coercion::ToPrimitiveHint::Number)?;
-        let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
+        let vb = self.coerce_primitive_bounded(self.regs[b], coercion::ToPrimitiveHint::Number)?;
         if va.is_symbol() || vb.is_symbol() {
             return self.raise_type_error("Cannot convert a Symbol value to a number");
         }
@@ -63,8 +63,8 @@ impl Vm {
     #[inline(always)]
     pub(crate) fn dispatch_lte(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
         vm_trace!("LTE rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
-        let va = self.coerce_primitive_bounded(self.regs[a], false)?;
+        let va = self.coerce_primitive_bounded(self.regs[a], coercion::ToPrimitiveHint::Number)?;
-        let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
+        let vb = self.coerce_primitive_bounded(self.regs[b], coercion::ToPrimitiveHint::Number)?;
         if va.is_symbol() || vb.is_symbol() {
             return self.raise_type_error("Cannot convert a Symbol value to a number");
         }
@@ -81,8 +81,8 @@ impl Vm {
     #[inline(always)]
     pub(crate) fn dispatch_gte(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
         vm_trace!("GTE rd={} r{}={:?} r{}={:?}", rd, a, self.regs[a], b, self.regs[b]);
-        let va = self.coerce_primitive_bounded(self.regs[a], false)?;
+        let va = self.coerce_primitive_bounded(self.regs[a], coercion::ToPrimitiveHint::Number)?;
-        let vb = self.coerce_primitive_bounded(self.regs[b], false)?;
+        let vb = self.coerce_primitive_bounded(self.regs[b], coercion::ToPrimitiveHint::Number)?;
         if va.is_symbol() || vb.is_symbol() {
             return self.raise_type_error("Cannot convert a Symbol value to a number");
         }

crates/oxide_vm/src/dispatch/member.rs

@@ -191,8 +191,8 @@ impl Vm {
             let obj = unsafe { &mut *obj_ptr };
             self.read_member_prop(obj, prop_name_si, receiver)?
         };
-        let prop_val = self.coerce_primitive_bounded(prop_raw, false)?;
+        let prop_val = self.coerce_primitive_bounded(prop_raw, coercion::ToPrimitiveHint::Number)?;
-        let rhs = self.coerce_primitive_bounded(self.regs[a], false)?;
+        let rhs = self.coerce_primitive_bounded(self.regs[a], coercion::ToPrimitiveHint::Number)?;
         if prop_val.is_symbol() || rhs.is_symbol() {
             // 复合成员加法分流同 `+`：字符串分支走 ToString、数值分支走 ToNumber，
             // 两者对 Symbol 均抛 TypeError（ECMA-262 §7.1.4 / §7.1.17）。

crates/oxide_vm/src/vm/dispatch_loop.rs

@@ -31,8 +31,8 @@ macro_rules! binary_arith {
         } else {
             // 注意：混合 BigInt/Number 检查不能在此前置（对象操作数如
             // `{valueOf: () => 2n}` 需先 ToPrimitive 再判定），统一放 coerce 之后。
-            let l = $self.coerce_primitive_bounded(lv, false)?;
+            let l = $self.coerce_primitive_bounded(lv, coercion::ToPrimitiveHint::Number)?;
-            let r = $self.coerce_primitive_bounded(rv, false)?;
+            let r = $self.coerce_primitive_bounded(rv, coercion::ToPrimitiveHint::Number)?;
             if l.is_symbol() || r.is_symbol() {
                 // ToNumber(Symbol) 抛 TypeError（ECMA-262 §7.1.4），先于 BigInt 混合判定。
                 $self.raise_type_error("Cannot convert a Symbol value to a number")?;

crates/oxide_vm/src/vm/error.rs

@@ -14,19 +14,19 @@ use crate::vm_debug;
 impl Vm {
     /// ToPrimitive 有界版：按规范序把对象转为原始值，失败统一抛 `TypeError`。
     ///
-    /// 对象上（沿原型链读取）的 `Symbol.toPrimitive` 优先；不存在时按 `prefer_string` 定序尝试
+    /// 对象上（沿原型链读取）的 `Symbol.toPrimitive` 优先；不存在时按 hint 定序尝试
     /// `toString`/`valueOf`，等价于 OrdinaryToPrimitive。
     ///
     /// # 步骤
     /// 1. 非对象或空指针原样返回。
     /// 2. 读 `@@toPrimitive`：存在则必须可调用（否则抛 `TypeError`），以
-    ///    `"string"`/`"number"` hint 调用；返回对象再抛 `TypeError`。
+    ///    hint 字符串（`"string"`/`"default"`/`"number"`）调用；返回对象再抛 `TypeError`。
     /// 3. 回退方法族：按 hint 顺序试 `toString`/`valueOf`，不可调用者跳过，
     ///    首个返回非对象的结果即采用。
     /// 4. 两条路径都不产出原始值时抛 `TypeError`。
     ///
     /// # 边界与前提
-    /// - `prefer_string` 为 `true` 时先试 `toString`，否则先试 `valueOf`。
+    /// - hint 为 `String` 时先试 `toString`，`Default`/`Number` 时先试 `valueOf`。
     /// - 方法调用经 `call_function_sync`；调用错误转 `raise_call_error` 恢复
     ///   原始异常。
     ///
@@ -36,7 +36,9 @@ impl Vm {
     /// # 注意事项
     /// - 主 dispatch 下就地展开异常；原生 builtin 内部只返回格式化 `Err`，
     ///   由其调用边界恢复（见 `conversion_error`）。
-    pub(crate) fn coerce_primitive_bounded(&mut self, value: JsValue, prefer_string: bool) -> Result<JsValue, String> {
+    pub(crate) fn coerce_primitive_bounded(
+        &mut self, value: JsValue, hint: coercion::ToPrimitiveHint,
+    ) -> Result<JsValue, String> {
         if !value.is_object() {
             return Ok(value);
         }
@@ -60,7 +62,7 @@ impl Vm {
                 self.conversion_error("Symbol.toPrimitive is not a function")?;
                 return Ok(JsValue::undefined());
             }
-            let hint_val = self.new_string(if prefer_string { "string" } else { "number" });
+            let hint_val = self.new_string(hint.as_str());
             let result = match self.call_function_sync(exotic, value, &[hint_val]) {
                 Ok(r) => r,
                 Err(err) => return self.raise_call_error(&err),
@@ -72,7 +74,7 @@ impl Vm {
             return Ok(result);
         }
 
-        let method_names = if prefer_string { ["toString", "valueOf"] } else { ["valueOf", "toString"] };
+        let method_names = if hint.prefer_string() { ["toString", "valueOf"] } else { ["valueOf", "toString"] };
 
         for method_name in method_names {
             let method_si = self.kernel_core.perm_interner().intern(method_name).0;
@@ -184,7 +186,7 @@ impl Vm {
     /// 对 BigInt 做 lossy 转换）。BigInt 入口语义：显式 lossy 站点
     /// （`Number` 构造器）先解盒自行转换，不经本入口。
     pub(crate) fn coerce_number_bounded(&mut self, value: JsValue) -> Result<f64, String> {
-        let primitive = self.coerce_primitive_bounded(value, false)?;
+        let primitive = self.coerce_primitive_bounded(value, coercion::ToPrimitiveHint::Number)?;
         if primitive.is_symbol() {
             self.conversion_error("Cannot convert a Symbol value to a number")?;
             return Ok(f64::NAN);

crates/oxide_vm/src/vm/vmhost.rs

@@ -253,8 +253,10 @@ impl oxide_runtime_api::VmHost for Vm {
     fn lookup_str(&self, val: JsValue) -> Option<String> {
         self.lookup_str(val)
     }
-    fn coerce_primitive_bounded(&mut self, value: JsValue, prefer_string: bool) -> Result<JsValue, String> {
+    fn coerce_primitive_bounded(
-        self.coerce_primitive_bounded(value, prefer_string)
+        &mut self, value: JsValue, hint: oxide_runtime_api::ToPrimitiveHint,
+    ) -> Result<JsValue, String> {
+        self.coerce_primitive_bounded(value, hint)
     }
     fn coerce_number_bounded(&mut self, value: JsValue) -> Result<f64, String> {
         self.coerce_number_bounded(value)

crates/oxide_vm/tests/builtins_date_tests.rs

@@ -1013,3 +1013,174 @@ fn date_to_primitive_existing_coercion_regression() {
     let r = eval(&mut vm, "typeof ('' + new Date(0))").unwrap();
     assert_eq!(str_val(&vm, r), "string");
 }
+
+// ── 严格 ISO 解析（Date Time String Format）──
+
+#[test]
+fn date_parse_extended_year_time_clip_boundaries() {
+    let mut vm = Vm::new();
+    // 扩展年落在 TimeClip 包络两端，按规范解析为包络端点值。
+    let r = eval(&mut vm, "Date.parse('275760-09-13T00:00:00Z')").unwrap();
+    assert_eq!(r.as_double(), 8.64e15);
+    let r = eval(&mut vm, "Date.parse('-271821-04-20T00:00:00Z')").unwrap();
+    assert_eq!(r.as_double(), -8.64e15);
+    // 扩展年越出包络：整体可识别，TimeClip 归 NaN。
+    let r = eval(&mut vm, "Date.parse('275761-01-01T00:00:00Z')").unwrap();
+    assert!(r.as_double().is_nan());
+    let r = eval(&mut vm, "Date.parse('-271822-01-01T00:00:00Z')").unwrap();
+    assert!(r.as_double().is_nan());
+}
+
+#[test]
+fn date_parse_negative_zero_year_rejected() {
+    let mut vm = Vm::new();
+    // 年 0 视为正，须写作 +000000；-000000 不是合法扩展年。
+    let r = eval(&mut vm, "Date.parse('-000000-01-01T00:00:00Z')").unwrap();
+    assert!(r.as_double().is_nan());
+    let r = eval(&mut vm, "Date.parse('+000000-01-01T00:00:00Z')").unwrap();
+    assert_eq!(r.as_double(), -62167219200000.0);
+}
+
+#[test]
+fn date_parse_date_only_is_utc() {
+    let mut vm = Vm::new();
+    // 日期-only 形式解释为 UTC 零点。
+    let r = eval(&mut vm, "Date.parse('2020-01-01')").unwrap();
+    assert_eq!(r.as_double(), 1577836800000.0);
+}
+
+#[test]
+fn date_parse_offsetless_datetime_is_local() {
+    let mut vm = Vm::new();
+    // 无偏移完整日期时间解释为本地时间（与本地构造器互证，宿主无关）。
+    let r = eval(&mut vm, "Date.parse('2020-01-01T12:00:00')").unwrap();
+    let r2 = eval(&mut vm, "new Date(2020, 0, 1, 12).getTime()").unwrap();
+    assert_eq!(r.as_double(), r2.as_double());
+}
+
+#[test]
+fn date_parse_midnight_24_accepted() {
+    let mut vm = Vm::new();
+    // 24:00:00 等价于次日 00:00。
+    let r = eval(&mut vm, "Date.parse('2020-01-01T24:00:00Z')").unwrap();
+    assert_eq!(r.as_double(), 1577923200000.0);
+    // 24 时仅允许 24:00:00 形态，分秒毫秒非零即非法。
+    let r = eval(&mut vm, "Date.parse('2020-01-01T24:01:00Z')").unwrap();
+    assert!(r.as_double().is_nan());
+    let r = eval(&mut vm, "Date.parse('2020-01-01T24:00:01Z')").unwrap();
+    assert!(r.as_double().is_nan());
+}
+
+#[test]
+fn date_parse_invalid_calendar_rejected() {
+    let mut vm = Vm::new();
+    // 月 13、二月 30 日、时 25 均不是合法日期时间串。
+    let r = eval(&mut vm, "Date.parse('2020-13-01T00:00:00Z')").unwrap();
+    assert!(r.as_double().is_nan());
+    let r = eval(&mut vm, "Date.parse('2020-02-30T00:00:00Z')").unwrap();
+    assert!(r.as_double().is_nan());
+    let r = eval(&mut vm, "Date.parse('2020-01-01T25:00:00Z')").unwrap();
+    assert!(r.as_double().is_nan());
+}
+
+// ── toISOString 6 位年与 TimeClip 边界 ──
+
+#[test]
+fn date_to_iso_string_six_digit_year() {
+    let mut vm = Vm::new();
+    // 4 位年零填充（epoch 为 1970 年）。
+    let r = eval(&mut vm, "new Date(0).toISOString()").unwrap();
+    assert_eq!(str_val(&vm, r), "1970-01-01T00:00:00.000Z");
+    // 年 0 输出 4 位 0000。
+    let r = eval(&mut vm, "new Date(-62167219200000).toISOString()").unwrap();
+    assert_eq!(str_val(&vm, r), "0000-01-01T00:00:00.000Z");
+    // 负年带负号前缀（年 -1 的 1 月 1 日）。
+    let r = eval(&mut vm, "new Date(-62198755200000).toISOString()").unwrap();
+    assert_eq!(str_val(&vm, r), "-000001-01-01T00:00:00.000Z");
+}
+
+#[test]
+fn date_to_iso_string_time_clip_boundaries() {
+    let mut vm = Vm::new();
+    // 包络两端合法（正年 > 9999 带 + 前缀 6 位，负年带 - 前缀 6 位）。
+    let r = eval(&mut vm, "new Date(8.64e15).toISOString()").unwrap();
+    assert_eq!(str_val(&vm, r), "+275760-09-13T00:00:00.000Z");
+    let r = eval(&mut vm, "new Date(-8.64e15).toISOString()").unwrap();
+    assert_eq!(str_val(&vm, r), "-271821-04-20T00:00:00.000Z");
+    // 越出包络一毫秒：时间值归 NaN，toISOString 抛 RangeError。
+    let r = eval(
+        &mut vm,
+        "try { new Date(8.64e15 + 1).toISOString(); 'no' } catch (e) { e instanceof RangeError ? 'yes' : 'no' }",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "yes");
+    let r = eval(
+        &mut vm,
+        "try { new Date(-8.64e15 - 1).toISOString(); 'no' } catch (e) { e instanceof RangeError ? 'yes' : 'no' }",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "yes");
+}
+
+// ── toJSON 泛型化 ──
+
+#[test]
+fn date_to_json_invalid_date_returns_null() {
+    let mut vm = Vm::new();
+    let r = eval(&mut vm, "new Date(NaN).toJSON()").unwrap();
+    assert!(r.is_null());
+}
+
+#[test]
+fn date_to_json_generic_non_date_this() {
+    let mut vm = Vm::new();
+    // 非有限 Number 结果返回 null（有限性检查仅对 Number 生效）。
+    let r = eval(&mut vm, "Date.prototype.toJSON.call(Infinity)").unwrap();
+    assert!(r.is_null());
+    // 字符串结果（非 Number）不拦截，直落 Invoke(toISOString)，
+    // 装箱后的 String 对象无该方法，抛 TypeError。
+    let r = eval(
+        &mut vm,
+        "try { Date.prototype.toJSON.call('2020-01-01T00:00:00Z'); 'no' } \
+         catch (e) { e instanceof TypeError ? 'yes' : 'no' }",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "yes");
+    // 有限数值接收者装箱后走到 Invoke(toISOString)，方法不可调用抛 TypeError。
+    let r = eval(
+        &mut vm,
+        "try { Date.prototype.toJSON.call(42); 'no' } catch (e) { e instanceof TypeError ? 'yes' : 'no' }",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "yes");
+}
+
+#[test]
+fn date_to_json_via_json_stringify() {
+    let mut vm = Vm::new();
+    let r = eval(&mut vm, "JSON.stringify({ a: new Date(0) })").unwrap();
+    assert_eq!(str_val(&vm, r), "{\"a\":\"1970-01-01T00:00:00.000Z\"}");
+}
+
+// ── 构造器单参对象：ToPrimitive 传 default 提示 ──
+
+#[test]
+fn date_constructor_single_arg_object_default_hint() {
+    let mut vm = Vm::new();
+    // 单参对象构造经 ToPrimitive（default 提示），@@toPrimitive 收到 "default"。
+    let r = eval(
+        &mut vm,
+        "var d = new Date({ [Symbol.toPrimitive]: function(h) { return h === 'default' ? 0 : 1; } }); \
+         d.getTime() === 0 ? 1 : 0",
+    )
+    .unwrap();
+    assert_eq!(r.as_int(), 1);
+}
+
+#[test]
+fn date_constructor_single_arg_truncates_before_time_clip() {
+    let mut vm = Vm::new();
+    // 单参数值先截断再 TimeClip；-0.5 截断为 -0，归一为 +0。
+    let r = eval(&mut vm, "Object.is(new Date(-0.5).getTime(), 0) ? 1 : 0").unwrap();
+    assert_eq!(r.as_int(), 1);
+}