chore: Explain reasoning, address comment

Author: MartinZikmund

src/Uno.Wasm.Bootstrap/ts/Uno/WebAssembly/Bootstrapper.ts

@@ -284,14 +284,16 @@ namespace Uno.WebAssembly.Bootstrap {
 
 			// The totalResources value reported by .NET does not represent
 			// the actual total. To prevent progress bar from jumping
-			// setting the max progress to 100 instead.
+			// setting the max progress to 100 instead and initially target 50
+			// When total number of resources increases, we always increase the target by half of the remainder to 100
+			// Usually the total grows several times, so ultimately the progress will appear as converging to completion.
 			if (_previousTotalResources != totalResources)
 			{
 				this._currentTargetProgress = this._currentTargetProgress + (100 - this._currentTargetProgress) / 2;
 				this._previousTotalResources = totalResources;
 			}
 
-			(<any>this.progress).value = Math.min(resourcesLoaded, this._currentTargetProgress);
+			this.progress.value = Math.min(resourcesLoaded, this._currentTargetProgress);
 		}
 
 		private initProgress() {