J. Ryan Stinnett 4e87fdcdfe Fix object diffing when objects have different keys ...

The object diff optimisation in 32cca0534c is not
correct for the case where `b` has some keys that are not in `a`.

By ensuring their key arrays are same length, we can preserve optimisation and
be correct as well.

Fixes https://github.com/vector-im/element-web/issues/16514

2021-02-24 13:45:25 +00:00

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