Default array should be created only if the key is a number and the index is in order

[boatkorachal]

The use case is when i use updeep to update the entities that normalized from normalizr package (https://github.com/gaearon/normalizr) and the ids are number.

But this will not fix the problem if the updated ids is happen to be in order (luckily most database has an incremental id field begins from 1 haha).

In my opinion, If there is an existing array, the update operation makes sense. But if there is no existing array, the new array should not be created

What do you think?

[aaronjensen]

These are good points.

@mindjuice you suggested defaulting to an array if the key was a number, but this incompatibility w/ normilizer (and just using numbers as keys in general) seems like a bigger deal to me.

I'm not sure that defaulting to an array in any case is the right answer, so I'm tending to agree w/ you, @boatkorachal.

@astephenb do you all ever rely on the default to array behavior?

[a-b-r-o-w-n]

@aaronjensen I don't think we ever rely on updeep's default array behavior. We do use u.withDefault with an array though.

[aaronjensen]

@boatkorachal I reverted #34 and released 0.11.0, hope it helps!