Consider official `dart:context` implements golang's context.Context pattern

[Morlay Null]

Golang's `context.Context` is a sucessful pattern for flow controling and context carrier.

When we use `dart` to make http servers, 
this pattern will be very useful. https://go.dev/blog/context

Here is an implament https://pub.dev/packages/contextdart

I use it to implement:

* cancelable http client https://pub.dev/packages/roundtripper
* logr https://pub.dev/packages/logr, which get Logger instance from context to avoid passing the Logger instance in each class structure.

[William Hesse]

Dart has zones, which accomplish many of the same objectives.

A new Zone can be created for an Http request, and it will be inherited by all synchronous and asynchronous code started by that request.

Data and handlers can be associated with that zone.
So perhaps Context can be implemented with zones, or zones can be used directly where this Context would be used.

See the description of zones at https://dart.dev/articles/archive/zones

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       - William Hesse