Item4 is missing in some `ValueTuple`s' `IStructuralEquatable.Equals`

[skyoxZ]

Description

Some ValueTuples' IStructuralEquatable.Equals methods skip comparing Item4.

runtime/src/libraries/System.Private.CoreLib/src/System/ValueTuple.cs

Lines 1123 to 1128 in 91ac6b3

	bool IStructuralEquatable.Equals(object? other, IEqualityComparer comparer) =>
	other is ValueTuple<T1, T2, T3, T4, T5> vt &&
	comparer.Equals(Item1, vt.Item1) &&
	comparer.Equals(Item2, vt.Item2) &&
	comparer.Equals(Item3, vt.Item3) &&
	comparer.Equals(Item5, vt.Item5);

Search vt.Item3) && in that file to find more.

Reproduction Steps

using System.Collections;

IStructuralEquatable a = ValueTuple.Create(1, 2, 3, 4, 5);
IStructuralEquatable b = ValueTuple.Create(1, 2, 3, 0, 5);

Console.WriteLine(a.Equals(b, EqualityComparer<object>.Default));
await Task.Delay(-1);

Expected behavior

False

Actual behavior

True

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

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Issue Details

---

Description

Some ValueTuples' IStructuralEquatable.Equals methods skip comparing Item4.

runtime/src/libraries/System.Private.CoreLib/src/System/ValueTuple.cs

Lines 1123 to 1128 in 91ac6b3

	bool IStructuralEquatable.Equals(object? other, IEqualityComparer comparer) =>
	other is ValueTuple<T1, T2, T3, T4, T5> vt &&
	comparer.Equals(Item1, vt.Item1) &&
	comparer.Equals(Item2, vt.Item2) &&
	comparer.Equals(Item3, vt.Item3) &&
	comparer.Equals(Item5, vt.Item5);

Search vt.Item3) && in that file to find more.

Reproduction Steps

using System.Collections;

IStructuralEquatable a = ValueTuple.Create(1, 2, 3, 4, 5);
IStructuralEquatable b = ValueTuple.Create(1, 2, 3, 0, 5);

Console.WriteLine(a.Equals(b, EqualityComparer<object>.Default));
await Task.Delay(-1);

Expected behavior

False

Actual behavior

True

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

Author:	skyoxZ
Assignees:	-
Labels:	bug, area-System.Runtime, untriaged, needs-area-label
Milestone:	-