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Explorer
There's a real question of whether or not you select all targets before you start resolving the attack rolls. Aside from a tweet from Mearls a year into the life of 5e, I can't find anything definitive. He did reply to Crawford, and Crawford didn't correct him, so take that for what it's worth.
As for for the bonus action timing regarding Eldritch Blast, I have to defer to Crawford's statement that explicit prevents nesting unless an exception is specified:
You don't, though. Honestly, you don't have to defer to Jeremy Crawford or Mike Mearls or anyone else. There are the published rules, there are your table's rules, and everything else is just advice. Jeremy can't change the rules on Twitter, or even through a Sage Advice pdf. The rules only change with errata.
Edit: it is worth pointing out that Sage Advice does not purport to tell you how Jeremy runs a game, or how he thinks you should run a game. Sage Advice exists to give you an interpretation of the rules that will be, as much as possible, uniformly consistent with other rules and suggested interpretations. He's trying to maintain an integrated system, not to make your game awesome. Frankly, I suspect that Jeremy Crawford believes that a DM running an awesome game will maybe take a look at the Sage Advice and then make his own mind up about how to rule over his own tabletop.
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