// We assume that all defaults are generics-safe, even if they aren't,
    // we take the risk.
    @SuppressWarnings("unchecked")
    T defaultValue = (T) defaults.getInstance(type.getRawType());
    if (defaultValue != null) {
      return defaultValue;
    }
    @SuppressWarnings("unchecked") // All arbitrary instances are generics-safe
    T arbitrary = (T) ArbitraryInstances.get(type.getRawType());

        when:
        configurationCacheRun()

        then:
        outputContains("CI = $defaultValue")

        when:
        configurationCacheRun()

        then:
        configurationCache.assertStateLoaded()
        noExceptionThrown()

        when:
        configurationCacheRunLenient("-DCI=$defaultValue") // use the default value

        then:
        configurationCache.assertStateStored()

								Name:         "custom_tag_env-var",
								DefaultValue: "custom-tag-env-default",
							},
						},
					},
					"custom_tag_request_header": {
						Type: &meshconfig.Tracing_CustomTag_Header{
							Header: &meshconfig.Tracing_RequestHeader{
								Name:         "custom_tag_request_header_name",
								DefaultValue: "custom-defaulted-value-request-header",
							},
						},