some thougt about the proposal-private-methods

compare.js

// 0 current proposal
// 1 this proposal
// 2 polyfilled

/* 2 */ const class_a_private_priv = Symbol('priv')
/* 2 */ const class_a_private_someSecretMethod = Symbol('someSecretMethod')
/* 2 */ const class_a_private_privProxy = Symbol('privProxy')
class a() {
  /* 0 */ #priv = 0;
  /* 1 */ private priv = 0;
  /* 2 */ constructor() { this[class_a_private_priv] = 0; }
  set(val) {
    /* 0 */ #priv = val;
    /* 1 */ private.priv = val;
    /* 2 */ this[class_a_private_priv] = val;
  }

  get(val) {
    /* 0 */ return #priv;
    /* 1 */ return private.priv;
    /* 2 */ return this[class_a_private_priv];
  }

  equal(that) {
    /* 0 */ return #priv === that.#priv 
    /* 1 */ return private.priv === private(that).priv
    /* 2 */ return this[class_a_private_priv] === that[class_a_private_priv];
  }

  someMethodThatWillCallOurSecretMethod() {
    /* 0 */ #someSecretMethod();
    /* 1 */ private.someSecretMethod();
    /* 2 */ this[class_a_private_someSecretMethod]();
  }

  /* 0 */ #someSecretMethod() {}
  /* 1 */ private someSecretMethod() {}
  /* 2 */ [class_a_private_someSecretMethod]() {}

  
  /* 0 */ get #privProxy () { return #priv; }
  /* 0 */ set #privProxy (value) { #priv = value; }
  /* 1 */ private get privProxy () { return private.priv; }
  /* 1 */ private set privProxy (value) { private.priv = value; }
  /* 2 */ get [class_a_private_privProxy] () { return this[class_a_private_priv]; }
  /* 2 */ set [class_a_private_privProxy] (value) { this[class_a_private_priv] = value; }

  
  /* 0 */ static compare(a, b) { return a#priv === b#priv; }
  /* 1 */ static compare(a, b) { return private(a).priv === private(b).priv; }
  /* 2 */ static compare(a, b) { return a[class_a_private_priv] === b[class_a_private_priv]; }
  
  anotherMethod(that, privateFieldName) {
    /* 0 */ ???
    /* 1 */ retrun private(that)[privateFieldName];
    /* 2 */ ???
  }
}
  
/*
the private(that)[privateFieldName] does not have any equivalent in current proposal
so it seems it introduced new behavior to the proposal
*/