Implement this callback to transform data into serializable data types immediately before an object is serialized.
Unity invokes the OnBeforeSerialize callback on an object before serializing it. In this callback, you can transform your data into something Unity understands. For example, to serialize a C# Dictionary, copy the data from the Dictionary object into an array of keys and an array of values.
Refer to Custom serialization in the Manual for more information.
**Note:** Unity calls OnBeforeSerialize before recompiling scripts in a domain reload, so any changes made to code in this method won't take effect until the second invocation of the callback following the change, in other words after a full serialization and domain reload cycle. For more information, refer to Details of disabling domain and scene reload in the Manual.