Transformable not being updated if set from variable

[doutatsu]

I've been trying to find a workaround for ages, as updating a Transformable from a variable doesn't work, as in this works:

@new_alarm.repeated = [1,2,3]
cdq.save

but not this:

arr = [1,2,3]
@new_alarm.repeated = arr
cdq.save

Is this a bug or I am doing something wrong?!