}
			m[k] = v
		}
	}
	if v, ok := m["default"]; ok {
		delete(m, "default")
		v = strings.TrimPrefix(v, "go")
		if gover.IsValid(v) {
			goVersion = v
		}
	}

	defaults := godebugForGoVersion(goVersion)
	if defaults != nil {
		// Apply m on top of defaults.
		for k, v := range m {
			defaults[k] = v
		}
		m = defaults
	}

	var keys []string
	for k := range m {