Special characters in plotly.js causing minification and packaging issues

I have identified an issue in the plotly.js library where special characters, such as σ and μ, are used in a function. This leads to problems during the minification/packaging process, causing certain package managers to fail as they do not correctly interpret these characters.

I found a related issue in the Parcel bundler repository, which has been addressed and fixed. The details can be found here: Parcel Issue #9370

I propose modifying the original plotly.js function to replace the special characters with safer alternatives. Below is the suggested modification:

normal: function(mu, sigma) {
  var n = arguments.length;
  if (n < 2) sigma = 1;
  if (n < 1) mu = 0;
  return function() {
    var x, y, r;
    do {
      x = Math.random() * 2 - 1;
      y = Math.random() * 2 - 1;
      r = x * x + y * y;
    } while (!r || r > 1);
    return mu + sigma * x * Math.sqrt(-2 * Math.log(r) / r);
  };
},

I will try to push a PR myself

在 plotly.js 源代码中搜索使用 mu 和 sigma 参数的 normal 函数，然后查看相关的 Parcel issue 以了解打包上下文。将有问题的特殊字符标识符替换为提议的更安全名称，并验证压缩和打包不再失败。