Great to get the ball rolling. Here's some issues I'd bring up at the meeting, 
so we can get a head start:

- As discussed recently in 
https://esdiscuss.org/topic/reflect-getownpropertysymbols, right now Reflect 
only holds counterparts to the proxy traps. I think this is kind of a nice 
property. Do we want to expand Reflect into a dumping ground for all 
"reflective" operations? That's been implied many times on the list, but so far 
hasn't happened, from what I can see. On the other hand, I don't have any good 
ideas for where else to put these things. (Maybe Function.isConstructor? Not 
sure it scales.)

- Reflect.isCallable seems pretty pointless, when you can just do `typeof x === 
"function"`. YAGNI IMO. Note that it also doesn't match your earlier 
description from 
https://esdiscuss.org/topic/determine-if-a-value-is-callable-constructible#content-0,
 so it presumably doesn't solve those use cases. (But that definition can't 
really be workable, since all of the things you mention as not being callable 
are actually callable, in the same way `function f() { throw new TypeError(); 
}` is callable.)

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