<commit_before>class None {
}

export default new None();

export const isNone = (value) =>
  value instanceof None;<commit_msg>make none safe across multiple classes<commit_after>class None {
  constructor() {
    this['@@qim/isNone'] = true;
  }
}

export default new None();

export const isNone = (value) =>
  value && value['@@qim/isNone'];
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{'dir': 'git-commits-cleaned', 'id': '1309136', 'n_tokens_mistral': 109, 'n_tokens_neox': 107, 'n_words': 32}