(Bloomberg) -- Vanguard Group Inc. is weighing whether to allow trading of cryptocurrency-focused exchange-traded funds on its platform, a move that would mark a major easing of its restrictive stance toward the popular but volatile asset class.Should the switch go through, it would open the door for Vanguard’s more than 50 million investors — with some $11 trillion in assets — to gain easier entry to digital assets. Vanguard itself doesn’t manage any crypto ETFS, and clients of the Valley Forge, Pennsylvan ...