length of keys in a map in Terraform - odd output

Question

Given:

variable "foo" {
  type = map
  default = {
    lorem = "ipsum"
    dolor = "sit"
  }
}

then, in Terraform console, why does [for k, v in var.foo : length(k) ] give:

[
  4,
  5,
]

Answer 1

That's a really odd result. When I run the exact same thing locally, I get the expected result:

> [for k, v in var.foo : length(k) ]
[
  5,
  5,
]

Do you have a value set for "foo" in a *.auto.tfvars file somewhere? How about an environment variable called TF_VAR_foo? My best guess is that there is a different variable defined somewhere called "foo" that is overwriting the default value specified in the variable declaration.