get the exact chart you wanted
Instead of helm pull $ARGS you can do helm pull-exactly $ARGS. The helm plugin will verify that the downloaded chart's version is equal to the passed in --version [VERSION].
helm respects SemVer and it will find matching versions when a simple lookup fails. For example bitnami/kubeapps--version 8.1.11+do.not.exist would resolve to 8.1.11.
helm plugin install https://github.com/nhomble/helm-pull-exactly