chore: add TODO for mitigating misuse of the LVal constructor

Author: ssoelvsten

rt/src/base/LVal.mts

@@ -23,6 +23,8 @@ export class LVal implements RawValue {
     __troupeType : Ty.TroupeType;
 
     constructor(v:any, l:Level, tlev:Level = null, posInfo:string = null) {
+        // TODO (2025-12-05): If `v` is another `LVal` do a copy of that object or
+        //                    throw an error
         this.val = v;
         this.lev = l;
         this.tlev = tlev == null ? l : tlev;