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I've been in this code for a few weeks, and I've collected up a bunch of pretty trivial cleanups and gripes into this single cleanup PR. There's almost nothing here that a person should review (by lines of code changed it's mostly changes to comments and fussing about with collections code).
I do think the buglet in 1145674 is worth looking at, though -- I'm pretty sure I'm implementing what was originally intended to be there, but take a look and see if you agree.
Note: I've added @tvernum as a reviewer just as an FYI to him that this PR exists, I don't actually need his +1 specifically (anybody the @elastic/es-security team is fine by me).