throw new UncheckedIOException(e);
        }
    }

    @Override
    public String version(String alias, Action<? super MutableVersionConstraint> versionSpec) {
        validateAlias(AliasType.VERSION, alias);
        alias = intern(AliasNormalizer.normalize(alias));
        if (versionConstraints.containsKey(alias)) {
            // For versions, in order to allow overriding whatever is declared by