amp-bind does not support splice with objects

[kul3r4]

Documentation says that amp-bind support splice for arrays.
At the moment, it only supports splice with primitives, but not with objects, for example:

var newObj = [{id: 1, l: 2}, {id: 2, l:4}]
newObj.splice(0,0,{id: 3})
newObj

is not supported. I reproduced the problem here where I get:

amp-bind: Expression eval failed with error: Unexpected argument type in splice().​​​

So I tried just using a number instead of an object, and the errors goes away.
@choumx FYI

[ampprojectbot]

This issue hasn't been updated in awhile. @choumx Do you have any updates?

[ampprojectbot]

This issue hasn't been updated in awhile. @choumx Do you have any updates?

[jackyjieliu]

@kul3r4 @choumx I'm also running into this issue trying to add an object into an array in amp-state when the user performs action.
Wondering if there are any updates or if there is a workaround.