v1.9.4: 1.9.4

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Bug fixes

• Started raising :py:exc:TypeError when a string value is passed into
  :py:meth:~yarl.URL.build as the port argument -- by :user:commonism.

  Previously the empty string as port would create malformed URLs when rendered as string representations. (#​883)

Packaging updates and notes for downstreams

• The leading -- has been dropped from the :pep:517 in-tree build
  backend config setting names. --pure-python is now just pure-python
  -- by :user:webknjaz.

  The usage now looks as follows:

  .. code-block:: console

  $ python -m build \
      --config-setting=pure-python=true \
      --config-setting=with-cython-tracing=true
  

  (#​963)

Contributor-facing changes

• A step-by-step :doc:Release Guide <contributing/release_guide> guide has
  been added, describing how to release yarl -- by :user:webknjaz.

  This is primarily targeting maintainers. (#​960)

• Coverage collection has been implemented for the Cython modules
  -- by :user:webknjaz.

  It will also be reported to Codecov from any non-release CI jobs.

  To measure coverage in a development environment, yarl can be
  installed in editable mode, which requires an environment variable
  YARL_CYTHON_TRACING=1 to be set:

  .. code-block:: console

  $ YARL_CYTHON_TRACING=1 python -Im pip install -e .
  

  Editable install produces C-files required for the Cython coverage
  plugin to map the measurements back to the PYX-files. (#​961)

• It is now possible to request line tracing in Cython builds using the
  with-cython-tracing :pep:517 config setting
  -- :user:webknjaz.

  This can be used in CI and development environment to measure coverage
  on Cython modules, but is not normally useful to the end-users or
  downstream packagers.

  Here's a usage example:

  .. code-block:: console

  $ python -Im pip install . --config-settings=with-cython-tracing=true
  

  For editable installs, this setting is on by default. Otherwise, it's
  off unless requested explicitly. (#​962)