Patch _.each to not treat {length: 5} as an array
Patch _.each to not treat {length: 5} as an array

Specifically, in all Underscore "collection" functions which treat their
arguments polymorphically as either "object-like" or "array-like", don't
treat arguments with `x.constructor === Object` as arrays (except for
the 'arguments' object).

Fixes #594. Fixes #1737.

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