[3.13] Regression when using @each on an array with undefined elements

[boris-petrov]

Here is a reproduction repo

The last commit downgrades Ember to 3.12 and the example works. The previous is on Ember 3.13 and does not.

Having a computed property that depends on an array with undefined in it by using @each is broken in 3.13.

P.S. The error is something like When using @each to observe the array ``, the items in the array must be objects.

[pzuraq]

Can confirm this is a change in behavior, the original assertion this was based on only runs against non-falsy values (terribly inconsistent, but no reason it should have changed). Will try to get a fix in for this today.