[boyfeiyu]

Class-level @noninjectable currently stores exclusions on the class, while injection reads them from __init__. In the dataclass example from #169, foo is therefore injected as 0 despite being explicitly excluded.

Apply class-level exclusions to a copy of the constructor, keeping inherited or shared constructor metadata isolated. Preserve staticmethod/classmethod descriptors and ordinary Python construction. Add regressions for dataclasses and regular classes, decorator order, missing and explicit arguments, inherited/shared constructors, stacked exclusions, and constructor closures/defaults; document dataclass decorator order.

Closes #169.

Validation on macOS arm64 / CPython 3.12.14: 158 pytest/doctest tests passed (97.08% coverage); mypy, Black, check-manifest, and package installation passed. The existing Injector limitation when injecting static/class constructors is unchanged; these descriptor regressions verify ordinary Python construction and metadata isolation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.93%. Comparing base (3177d40) to head (f333474).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
+ Coverage   96.83%   96.93%   +0.09%     
==========================================
  Files           1        1              
  Lines         601      620      +19     
  Branches      103      109       +6     
==========================================
+ Hits          582      601      +19     
  Misses         13       13              
  Partials        6        6              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[boyfeiyu]

Fixed the PyPy constructor-copy failure in eec065e. PyPy exposes native object/list initializers as functions with builtin code and no globals dictionary; the copy path now requires Python code and dictionary globals.

On macOS arm64 with PyPy 8.0.1 / Python 3.11.17, the previous head reproduces the four CI failures and this commit passes all 162 tests. CPython 3.11.18 also passes all 162 tests; the 17 focused regressions, type/format checks and packaging checks pass. Ubuntu and the remaining CI matrix still need remote validation.