create list of exotic JavaScript values

[michaelficarra]

This was a topic of discussion during the Nov 2018 breakout sessions. It would be useful for proposal champions if they had a document that gave examples of exotic JavaScript values that they could use to consider how their proposal interacts with them. We should try to compile a list of these values, probably starting with ones that have been the source of errors in the past.

/cc @natashenka

[littledan]

test262 has some interesting values that various tests put into things, maybe this would be a starting point. cc @leobalter @Ms2ger

[natashenka]

I am hoping to get around to this soon-- I was wondering if there's anyone who's familiar with test262 who could help me figure out where to place these tests in the repository and the best way to import a large list of objects into multiple tests