Potential issue with duplicate subscription ids

[lovelysandwich]

"AllSubscriptionIds": {
"Type": "Computed",
"Value": [
"{%ManagementSubscriptionId%}",
"{%ConnectivitySubscriptionId%}",
"{%IdentitySubscriptionId%}"
],
"Targets": [
{
"Name": "parSubscriptionIds.value",
"Destination": "Parameters"
}
]
},

I have a worry that if the customer gives the same id for subscription ids, this is going to make the value invalid when we come to deploy with it.

Expected Behavior

Perhaps do a safe (case insensitive) distinct on these values...