Support Symbol for container id

[hisham]

Description

Container.of used to accept instanceId of any. Now it only accepts string (see this commit: 511e37f). Shouldn't it also support Symbol or Token to prevent name clashes?

Proposed solution

Should be able to do Container.of(Symbol('my-container'))

[NoNameProvided]

Yes, it was simplified to allow easier internal workings. Why using string IDs doesn't work for you?

[hisham]

If two parts of an app use the same string without knowing, you'll get a clash. While if they encapsulate it with a Symbol you won't.

[hisham]

See this article for more info: https://blog.thoughtram.io/angular/2016/05/23/opaque-tokens-in-angular-2.html

Article is focused on Angular dependency injection but the jist of it is the same.

[NoNameProvided]

This is added in 0c0dcab and will be included in the next release.