Only inject objects with the @inject decorator and objects with a @provider

Edit: This post originally had a question on how to solve a specific problem, but is updated with the solution and requested change described in https://github.com/alecthomas/injector/issues/116#issuecomment-647505337:

Injector should require a @provider or a constructor with the @inject decorator for an object to be created.

The original post is kept below.

As mentioned before in #78, I feel that the way Injector has default values for "value types" such as such as str, int and bool is pretty counter-intuitive, and therefore risky. Removing that would obviously break backwards compatibility, but I'd like you to consider that.

To me, the use case for Injector is primarily to inject dependent classes. It is in some cases also useful to configure these classes with parameters that may be value types, but commonly the values shouldn't be the same for every every class they configure.

Is there a design decision behind the current behavior, or is it rather a consequence of the implementation?

No files, tests, or entry points are named in the issue. Start by tracing how Injector currently creates objects and handles @provider and @inject, then inspect existing tests for constructor injection and providers. Done means un-decorated constructors are not implicitly used, while explicitly provided or @inject-decorated objects remain creatable.