Manually implement equality on `AxisSpec`

fixes 76a30e5d7

src/BizHawk.Emulation.Common/Base Implementations/Axes/AxisSpec.cs

@@ -1,9 +1,19 @@
+using System.Runtime.CompilerServices;
+
 using BizHawk.Common;
 
 namespace BizHawk.Emulation.Common
 {
-	public readonly record struct AxisSpec
+	public readonly struct AxisSpec : IEquatable<AxisSpec>
 	{
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static bool operator ==(AxisSpec a, AxisSpec b)
+			=> a.Equals(b);
+
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static bool operator !=(AxisSpec a, AxisSpec b)
+			=> !a.Equals(b);
+
 		/// <summary>
 		/// Gets the axis constraints that apply artificial constraints to float values
 		/// For instance, a N64 controller's analog range is actually larger than the amount allowed by the plastic that artificially constrains it to lower values
@@ -34,5 +44,17 @@ namespace BizHawk.Emulation.Common
 			Neutral = neutral;
 			Range = range;
 		}
+
+		public bool Equals(AxisSpec other)
+			=> Range == other.Range
+				&& Neutral == other.Neutral
+				&& IsReversed == other.IsReversed
+				&& Constraint == other.Constraint;
+
+		public override bool Equals(object? obj)
+			=> obj is AxisSpec other && Equals(other);
+
+		public override int GetHashCode()
+			=> HashCode.Combine(Range.Start, Range.EndInclusive, Neutral, IsReversed, Constraint);
 	}
 }