Removes IEquatable constraint from ThrowIfEqual/NotEqual

[IDisposable]

Removes the IEquatable constraint from the ThrowIfEqual and ThrowIfNotEqual methods in ArgumentOutOfRangeException.

• Allows these methods to be used with types that don't implement IEquatable, relying on EqualityComparer.Default.Equals for equality comparisons.
• This broadens the applicability of these methods without sacrificing functionality.

Resolves #118053

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[tannergooding]

This likely needs to wait for .NET 11 since we are locking down for RC1.

However, this is something that I would be willing to take a bar check around given how frequently its been asked for and its a minor change just relaxing a constraint. -- CC. @jeffhandley for secondary input

[Copilot]

Pull Request Overview

This PR removes the IEquatable<T> constraint from the ThrowIfEqual and ThrowIfNotEqual methods in ArgumentOutOfRangeException, allowing these methods to work with any type rather than just those implementing IEquatable<T>. The methods will continue to use EqualityComparer<T>.Default.Equals for equality comparisons, which provides appropriate equality behavior for all types.

Key changes:

• Removes generic type constraints from ThrowIfEqual and ThrowIfNotEqual methods
• Updates corresponding test helper methods to match the new signatures
• Maintains existing functionality while broadening method applicability

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/libraries/System.Private.CoreLib/src/System/ArgumentOutOfRangeException.cs	Removes IEquatable<T> constraint from method signatures
src/libraries/System.Runtime/ref/System.Runtime.cs	Updates public API reference to reflect constraint removal
src/libraries/System.Runtime/tests/System.Runtime.Tests/System/ArgumentOutOfRangeExceptionTests.cs	Updates test helper methods to match new method signatures

[jeffhandley]

/backport to release/10.0

I'm supportive of this coming in for 10.0 RC2

[github-actions]

Started backporting to release/10.0: https://github.com/dotnet/runtime/actions/runs/17387958834