code: function qualify(name, namespace) {
    if (~name.indexOf('.')) {
      name = name.replace(/^\./, ''); // Allow absolute referencing.
    } else if (namespace) {
      name = namespace + '.' + name;
    }
    name.split('.').forEach(function (part) {
      if (!isValidName(part)) {
        throw new Error(f('invalid name: %j', name));
      }
    });
    var tail = unqualify(name);
    // Primitives are always in the global namespace.
    return isPrimitive(tail) ? tail : name;
  }
docs: Verify and return fully qualified name.
  
  @param name {String} Full or short name. It can be prefixed with a dot to
  force global namespace.
  @param namespace {String} Optional namespace.