Add note that isObject returns true for arrays/functions

[cnlevy]

No description provided.

[mary-poppins]

Thanks for the PR! Please check the items below to help us merge this faster. See the contributing docs for more information.

• Uses the issue template (#6353)

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[caitp]

... and functions ...

No, JavaScript does not report the type of a function as an object, even though they are object-like. isObject() will return false for functions

[khepin]

If adding this, it would be worth adding that functions will also be considered objects.

[caitp]

Yeah, functions are not considered objects by angular.isObject(), it's really just a short form for value && typeof(value) === "object". I can appreciate that that might be confusing =)