The value is only multiplied by the API for topics in non-premium namespaces
TF_ACC=1 go test ./builtin/providers/azurerm -v -run TestAccAzureRMServiceBusTopic_enablePartitioning -timeout 120m
=== RUN TestAccAzureRMServiceBusTopic_enablePartitioningStandard
--- PASS: TestAccAzureRMServiceBusTopic_enablePartitioningStandard (378.80s)
=== RUN TestAccAzureRMServiceBusTopic_enablePartitioningPremium
--- PASS: TestAccAzureRMServiceBusTopic_enablePartitioningPremium (655.00s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/azurerm 1033.874s