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Address a number of issues with array-like "to satisfy".

While trying to write tests for the expect context being passed to
an invocation of expect.it when satisfying array-like subjects some
other issues around key checking became apparent.

First, when a non-numerical property comparison is forced by it
being supplied on the RHS this should work. Secondly, in the case
of a non-numerical array-like there was an issue calculating how
many outstanding keys there were when enumerability differences
came into the picture. Both of the added test cases exercise this
thoroughly.

Note that this commit also fixes the context issue.

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