Terraform: Typo in parameter name for object with two optionals

main.tf

#---
# terraform plan -var complex='{one={name="jack", email="j@example.com", phon="121212"}}'
#
# This validation does not help catching typos because Terraform discards
# values not specified in the type, and without warning!
#
# https://github.com/hashicorp/terraform/issues/29204
#--
variable "complex" {
  description = "Complex object with two optionals"

  type = map(object({
    email = optional(string)
    phone = optional(string)
  }))

  validation {
    condition = alltrue(
      flatten([
        for o in var.complex :
        [for k in keys(o) : contains(["name", "email", "phone"], k)]
      ])
    )
    error_message = "Did you make a typo"
  }
}

output "complex" {
  value = var.complex
}