Version comparison does not check metadata

The metadata isn't checked when comparing versions. This is causing Terraform to pull an incorrect module version for some: https://github.com/hashicorp/terraform/issues/20814

Start by reading the linked Terraform issue and tracing how this library compares versions. Reproduce the incorrect module-version selection, identify the comparison entry point and relevant tests, and consider the issue done when metadata differences produce the expected ordering and the regression is covered by tests.

Written by the indexing model from the issue text.