code: function checkNumberOrInterpolation(i) {
    const start = i;
    let l;
  
    while (i < tokensLength) {
      if (l = checkInterpolation(i) || checkNumber(i)) i += l;
      else break;
    }
  
    return i - start;
  }
docs: Check if token is a number or an interpolation
  @param {number} i Token's index number
  @return {number}