Openstack provider boolean values create a change

[cvvs]

I'm going to use subnet in the example, but this happens with other boolean values in the Openstack provider, such as "admin_state_up" in the router resource.

Any time I set a boolean value to true in the config, the terraform plan reports that it will change from "true" => "1"

Here's the resource definition (fixed to note that we actually use true, not 1)

resource "openstack_networking_subnet_v2" "subnet-internal" {
    network_id = "${openstack_networking_network_v2.network-internal.id}"
    tenant_id = "${var.tenant_id}"
    region = "${var.openstack_region}"
    cidr = "${var.internal_cidr}"
    gateway_ip = "${var.internal_gateway}"
    enable_dhcp = true
    dns_nameservers = ["${split(" ", var.dns_nameservers)}"]
    ip_version = 4
    allocation_pools = {
        "start" = "${var.internal_dhcp_start}"
        "end" = "${var.internal_dhcp_end}"
   }
}

Here's the current state:

"openstack_networking_subnet_v2.subnet-internal": {
    "type": "openstack_networking_subnet_v2",
    "depends_on": [
        "openstack_networking_network_v2.network-internal"
    ],
    "primary": {
        "id": "d2cc8a10-2e74-400a-8720-9951e6dafc39",
        "attributes": {
            "allocation_pools.#": "1",
            "allocation_pools.0.end": "192.168.222.254",
            "allocation_pools.0.start": "192.168.222.100",
            "cidr": "192.168.222.0/24",
            "dns_nameservers.#": "2",
            "dns_nameservers.3811298194": "8.8.4.4",
            "dns_nameservers.3817307869": "8.8.8.8",
            "enable_dhcp": "true",
            "gateway_ip": "192.168.222.1",
            "host_routes.#": "0",
            "id": "d2cc8a10-2e74-400a-8720-9951e6dafc39",
            "ip_version": "4",
            "name": "",
            "network_id": "0ba33147-2340-467d-b691-255921cf7a89",
            "region": "foo",
            "tenant_id": "f79b28dcf6b34b0a8c847a5e35ffcd05"
        }
    }
}

This is the output of terraform plan

~ openstack_networking_subnet_v2.subnet-internal
       enable_dhcp: "true" => "1"

[ghost]

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