List of potential N-API breaking changes

[jasongin]

After N-API exits experimental status, we can no longer make breaking changes. So we should track any issues that might force breaking changes, to ensure they are resolved before then. Here are the ones that I am aware of:

• Change napi_add_register_func callback for better ES6 module compatibility ES6 module loader compatibility #256 (Taylor)
• Replace napi_create_number() with APIs that take more specific types (for perf) n-api: optimize number API performance node#14573
• Replace napi_is_construct_call() with API that gets the new-target for constructors Consider "new.target" for constructor callbacks #200
• Add async hooks context parameter to napi_make_callback() Integrate C++ AsyncHooks Embedder API with native abstraction node#13254 (Jason)
• Add optional length to functions accepting const char* n-api: Add optional length to functions accepting const char *  node#15108
  (We still haven't decided whether we will do anything for this.)

[jasongin]

The changes for async hooks are in 2 PRs: nodejs/node#14697, nodejs/node#15189

[mhdawson]

Now just waiting on nodejs/node#15108
@sampsongao will add the tests tonight and hopefully we can land Friday Sep 15

[mhdawson]

We've done what we were going to do on this front, closing.