Mark ReagentUnit instance methods are readonly.

Content.Shared/Chemistry/ReagentUnit.cs

@@ -19,7 +19,7 @@ namespace Content.Shared.Chemistry
         public static ReagentUnit Epsilon { get; } = new(1);
         public static ReagentUnit Zero { get; } = new(0);
 
-        private double ShiftDown()
+        private readonly double ShiftDown()
         {
             return _value / Math.Pow(10, Shift);
         }
@@ -164,17 +164,17 @@ namespace Content.Shared.Chemistry
             return a._value > b._value;
         }
 
-        public float Float()
+        public readonly float Float()
         {
             return (float) ShiftDown();
         }
 
-        public double Double()
+        public readonly double Double()
         {
             return ShiftDown();
         }
 
-        public int Int()
+        public readonly int Int()
         {
             return (int) ShiftDown();
         }
@@ -204,14 +204,15 @@ namespace Content.Shared.Chemistry
             return reagent < min ? min : reagent > max ? max : reagent;
         }
 
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is ReagentUnit unit &&
                    _value == unit._value;
         }
 
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
+            // ReSharper disable once NonReadonlyMemberInGetHashCode
             return HashCode.Combine(_value);
         }
 
@@ -220,19 +221,19 @@ namespace Content.Shared.Chemistry
             _value = FromFloat(FloatFromString(value));
         }
 
-        public override string ToString() => $"{ShiftDown().ToString(CultureInfo.InvariantCulture)}";
+        public override readonly string ToString() => $"{ShiftDown().ToString(CultureInfo.InvariantCulture)}";
 
-        public string Serialize()
+        public readonly string Serialize()
         {
             return ToString();
         }
 
-        public bool Equals(ReagentUnit other)
+        public readonly bool Equals(ReagentUnit other)
         {
             return _value == other._value;
         }
 
-        public int CompareTo(ReagentUnit other)
+        public readonly int CompareTo(ReagentUnit other)
         {
             if(other._value > _value)
             {