Drop the [Any, Any] type arguments from assertEquals

[halotukozak]

Tests no longer need assertEquals[Any, Any] to compare union types (for example X | Null under -Yexplicit-nulls).

munit derives Compare[A, B] from compareSubtypeWithSupertype[A, B](using A <:< B). Resolving a given with a nested using for a union type makes -Winfer-union warn, even with explicit type arguments, although nothing is inferred there. That looks like a compiler false positive.

The new UnionSafeCompare test trait provides the same two instances through type bounds (A <: B / B <: A), which compile without the warning. The subtype instance lives in a subtrait so that it wins when both apply. Comparing unrelated types still fails to compile with munit's "Can't compare".

🤖 Generated with Claude Code

Summary by CodeRabbit

• Tests
  • Improved test coverage for union-result matching, including comparisons where expected and actual values have related types. This helps verify that matching results are compared correctly.

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Reviewing files that changed from the base of the PR and between 343e241 and 7290c9a.

📒 Files selected for processing (2)

• test/mrpc/UnionSafeCompare.scala
• test/mrpc/derive/MatchSuite.scala

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