Group membership always shows as needing to be modified if there are > 100 users

[miquella]

Terraform Version

terraform -v
Terraform v0.6.15

Affected Resource(s)

• aws_iam_group_membership

Terraform Configuration Files

provider "aws" {
    region = "us-east-1"
}

resource "aws_iam_group" "Users" {
    name = "Users"
}

resource "aws_iam_group_membership" "Users" {
    name = "Users"
    group = "${aws_iam_group.Users.name}"
    users = [
        "${aws_iam_user.user1.name}",
        "${aws_iam_user.user2.name}",
        "${aws_iam_user.user3.name}",
        # ...
        "${aws_iam_user.user151.name}",
    ]
}

Expected Behavior

terraform plan should show:

# …

No changes. Infrastructure is up-to-date. This means that Terraform
could not detect any differences between your configuration and
the real physical resources that exist. As a result, Terraform
doesn't need to do anything.

Actual Behavior

terraform plan shows:

# …

~ aws_iam_group_membership.Users
    users.#:          "100" => "151"
    users.1071630348: "user1" => "user1"
    users.1075486292: "" => "user2"
    # …

Steps to Reproduce

Please list the steps required to reproduce the issue, for example:

1. Create an aws_iam_group_membership resource with 101+ users
2. terraform apply
3. terraform plan

[ghost]

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