fix: align slice/set equality and harden queue API

slice_test.go

@@ -56,6 +56,18 @@ func TestSlice_Equal(t *testing.T) {
 	}
 }
 
+func TestSlice_EqualIgnoresCapacity(t *testing.T) {
+	a1 := make(Slice[int], 2, 2)
+	a2 := make(Slice[int], 2, 4)
+
+	a1[0], a1[1] = 1, 2
+	a2[0], a2[1] = 1, 2
+
+	if !a1.Equal(a2) {
+		t.Errorf("a1 != a2")
+	}
+}
+
 func TestSlice_Pop(t *testing.T) {
 	a1 := make(Slice[int], 10)
 	a2 := make(Slice[int], 9)
@@ -76,3 +88,17 @@ func TestSlice_Pop(t *testing.T) {
 		t.Errorf("a1 != a2")
 	}
 }
+
+func TestSlice_PopFrontEqual(t *testing.T) {
+	a1 := make(Slice[int], 3, 5)
+	a2 := make(Slice[int], 2, 2)
+
+	a1[0], a1[1], a1[2] = 0, 1, 2
+	a2[0], a2[1] = 1, 2
+
+	a1 = a1.Pop(0)
+
+	if !a1.Equal(a2) {
+		t.Errorf("a1 != a2")
+	}
+}