decimals not allowed to update as global varibles from Unity to C# script?,Why are decimals not allowed to apply as global variable to be changed in Unity?

I'm going to answer in regards to Flash-G's answer posted above. I don't disagree with his statement, but I think there are routes that were left out of the answer.

Nothing he said was inaccurate, you can not just serialize a decimal data type without some work. What you can do though, is you can create your own version of decimal and store that. I posted some basic code that can achieve this. You would need to write a custom property drawer to get it to operate the way that you want. This is untested and people should correct me where I'm making false assumptions here, but this is where I would start with the problem.

 using System;
     using System.Globalization;
     using UnityEngine;
 
     [Serializable]
     public class UnityDecimal : ISerializationCallbackReceiver
     {
         private decimal _decimalValue;
 
         [SerializeField]
         private string _storedValue;
 
         public decimal Value
         {
             get
             {
                 return _decimalValue;
             }
             set
             {
                 _decimalValue = value;
             }
         }
 
         public void OnBeforeSerialize()
         {
             _storedValue = Convert.ToString(_decimalValue, CultureInfo.InvariantCulture);
         }
 
         public void OnAfterDeserialize()
         {
             _decimalValue = Convert.ToDecimal(_storedValue);
         }
     }

Well the training class did not indicate public/serializable fields, but if that is what they are called, I will forget it by tomorrow. :) Basically they the field "public double BaseStoreCost;" was listed in c# and on the Unity graphics engine you can see it in a box to edit.

the basic program I am learning to build is fine with float/double. but I eventually want to get it to need extremely precise numbers. I tinkered with c and c++ in the past and found how unreliable precision is with float and double. When I found decimal I was happy.

I did figure out a way around my issue though. I used float/double as my basis for the serialized field and converted it to decimal for the final storage.