src/vs/workbench/services/workingCopy/common/fileWorkingCopyManager.ts/FileWorkingCopyManager/get
class FileWorkingCopyManager:	get(resource: URI): IUntitledFileWorkingCopy<U> | IStoredFileWorkingCopy<S> | undefined {
		return this.stored.get(resource) ?? this.untitled.get(resource);
	}