DOM `equals` should allow comparisons between `Integer` and other numeric types

[zslayton]

equals is intended to provide intuitive value-based comparisons. Right now, any comparison between a DOM Integer and any other numeric type (besides JSBI) is false. This behavior is appropriate for ionEquals, but surprising for equals.

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No it only allows number and JSBI with Integer.

Originally posted by @desaikd in #695 (comment)