docs: function setLocalNamespace (alias, postfix) {
      // require valid alias
      assert.ok(typeof alias === 'string' && alias.length > 1, 'valid namespace alias required')
      // do not allow the alias session to be used
      assert.ok(!reservedNamespaces[alias], `namespace alias ${alias} is reserved`)
      // require valid postfix
      assert.ok(typeof postfix === 'string' && postfix.length > 1, 'valid namespace postfix required')
      // set namespace
      GLOBAL.localNamespaces[alias] = postfix
      // return class
      return ImmutableAI
  }