5 files changed, 58 insertions, 10 deletions
diff --git a/core/variant/binder_common.h b/core/variant/binder_common.h
index 358b3df0c5..81ac5adba7 100644
--- a/core/variant/binder_common.h
+++ b/core/variant/binder_common.h
@@ -146,22 +146,53 @@ VARIANT_ENUM_CAST(Side);
 VARIANT_ENUM_CAST(ClockDirection);
 VARIANT_ENUM_CAST(Corner);
 VARIANT_ENUM_CAST(HatDir);
-VARIANT_ENUM_CAST(HatMask);
+VARIANT_BITFIELD_CAST(HatMask);
 VARIANT_ENUM_CAST(JoyAxis);
 VARIANT_ENUM_CAST(JoyButton);
-VARIANT_ENUM_CAST(Key);
-VARIANT_ENUM_CAST(KeyModifierMask);
+
 VARIANT_ENUM_CAST(MIDIMessage);
 VARIANT_ENUM_CAST(MouseButton);
+VARIANT_BITFIELD_CAST(MouseButtonMask);
 VARIANT_ENUM_CAST(Orientation);
 VARIANT_ENUM_CAST(HorizontalAlignment);
 VARIANT_ENUM_CAST(VerticalAlignment);
 VARIANT_ENUM_CAST(InlineAlignment);
 VARIANT_ENUM_CAST(PropertyHint);
-VARIANT_ENUM_CAST(PropertyUsageFlags);
+VARIANT_BITFIELD_CAST(PropertyUsageFlags);
 VARIANT_ENUM_CAST(Variant::Type);
 VARIANT_ENUM_CAST(Variant::Operator);
 
+// Key
+
+VARIANT_ENUM_CAST(Key);
+VARIANT_BITFIELD_CAST(KeyModifierMask);
+
+static inline Key &operator|=(Key &a, BitField<KeyModifierMask> b) {
+	a = static_cast<Key>(static_cast<int>(a) | static_cast<int>(b.operator int64_t()));
+	return a;
+}
+
+static inline Key &operator&=(Key &a, BitField<KeyModifierMask> b) {
+	a = static_cast<Key>(static_cast<int>(a) & static_cast<int>(b.operator int64_t()));
+	return a;
+}
+
+static inline Key operator|(Key a, BitField<KeyModifierMask> b) {
+	return (Key)((int)a | (int)b.operator int64_t());
+}
+
+static inline Key operator&(Key a, BitField<KeyModifierMask> b) {
+	return (Key)((int)a & (int)b.operator int64_t());
+}
+
+static inline Key operator+(BitField<KeyModifierMask> a, Key b) {
+	return (Key)((int)a.operator int64_t() + (int)b);
+}
+
+static inline Key operator|(BitField<KeyModifierMask> a, Key b) {
+	return (Key)((int)a.operator int64_t() | (int)b);
+}
+
 template <>
 struct VariantCaster<char32_t> {
 	static _FORCE_INLINE_ char32_t cast(const Variant &p_variant) {
diff --git a/core/variant/callable.cpp b/core/variant/callable.cpp
index 849bfaa38f..fd85fe78f6 100644
--- a/core/variant/callable.cpp
+++ b/core/variant/callable.cpp
@@ -102,6 +102,20 @@ Callable Callable::bindp(const Variant **p_arguments, int p_argcount) const {
 	}
 	return Callable(memnew(CallableCustomBind(*this, args)));
 }
+
+Callable Callable::bindv(const Array &p_arguments) {
+	if (p_arguments.is_empty()) {
+		return *this; // No point in creating a new callable if nothing is bound.
+	}
+
+	Vector<Variant> args;
+	args.resize(p_arguments.size());
+	for (int i = 0; i < p_arguments.size(); i++) {
+		args.write[i] = p_arguments[i];
+	}
+	return Callable(memnew(CallableCustomBind(*this, args)));
+}
+
 Callable Callable::unbind(int p_argcount) const {
 	return Callable(memnew(CallableCustomUnbind(*this, p_argcount)));
 }
diff --git a/core/variant/callable.h b/core/variant/callable.h
index c80481c0aa..10d291ac24 100644
--- a/core/variant/callable.h
+++ b/core/variant/callable.h
@@ -98,6 +98,7 @@ public:
 
 	template <typename... VarArgs>
 	Callable bind(VarArgs... p_args);
+	Callable bindv(const Array &p_arguments);
 
 	Callable bindp(const Variant **p_arguments, int p_argcount) const;
 	Callable unbind(int p_argcount) const;
diff --git a/core/variant/type_info.h b/core/variant/type_info.h
index d3b507ba4d..e89658d25b 100644
--- a/core/variant/type_info.h
+++ b/core/variant/type_info.h
@@ -287,11 +287,14 @@ class BitField {
 	int64_t value = 0;
 
 public:
-	_FORCE_INLINE_ void set_flag(T p_flag) { value |= p_flag; }
-	_FORCE_INLINE_ bool has_flag(T p_flag) const { return value & p_flag; }
-	_FORCE_INLINE_ void clear_flag(T p_flag) { return value &= ~p_flag; }
+	_FORCE_INLINE_ void set_flag(T p_flag) { value |= (int64_t)p_flag; }
+	_FORCE_INLINE_ bool has_flag(T p_flag) const { return value & (int64_t)p_flag; }
+	_FORCE_INLINE_ bool is_empty() const { return value == 0; }
+	_FORCE_INLINE_ void clear_flag(T p_flag) { value &= ~(int64_t)p_flag; }
+	_FORCE_INLINE_ void clear() { value = 0; }
 	_FORCE_INLINE_ BitField() = default;
 	_FORCE_INLINE_ BitField(int64_t p_value) { value = p_value; }
+	_FORCE_INLINE_ BitField(T p_value) { value = (int64_t)p_value; }
 	_FORCE_INLINE_ operator int64_t() const { return value; }
 	_FORCE_INLINE_ operator Variant() const { return value; }
 };
diff --git a/core/variant/variant_call.cpp b/core/variant/variant_call.cpp
index 6b6df0a5c7..6c06b63dab 100644
--- a/core/variant/variant_call.cpp
+++ b/core/variant/variant_call.cpp
@@ -2018,6 +2018,7 @@ static void _register_variant_builtin_methods() {
 	bind_method(Callable, get_method, sarray(), varray());
 	bind_method(Callable, get_bound_arguments_count, sarray(), varray());
 	bind_method(Callable, hash, sarray(), varray());
+	bind_method(Callable, bindv, sarray("arguments"), varray());
 	bind_method(Callable, unbind, sarray("argcount"), varray());
 
 	bind_custom(Callable, call, _VariantCall::func_Callable_call, true, Variant);
@@ -2060,9 +2061,7 @@ static void _register_variant_builtin_methods() {
 	bind_method(Transform2D, interpolate_with, sarray("xform", "weight"), varray());
 	bind_method(Transform2D, is_equal_approx, sarray("xform"), varray());
 	bind_method(Transform2D, is_finite, sarray(), varray());
-	bind_method(Transform2D, set_rotation, sarray("rotation"), varray());
-	bind_method(Transform2D, set_scale, sarray("scale"), varray());
-	bind_method(Transform2D, set_skew, sarray("skew"), varray());
+	// Do not bind functions like set_rotation, set_scale, set_skew, etc because this type is immutable and can't be modified.
 	bind_method(Transform2D, looking_at, sarray("target"), varray(Vector2()));
 
 	/* Basis */