PyGerber version 3.0.0a4 will continue incremental changes on top of 3.0.0a3.
There are still some breaking changes to be introduced (see list below). I will try to squish them into this release, then we can start beta development phase.

Changelog:

• Relaxed pyparsing dependency requirements to allow for use of 3.2 and above for
  supported Python versions.
• Relaxed numpy dependency requirements to allow for use of 2.x and above for
  supported Python versions.
• Relaxed pydantic dependency requirements to allow for use of 2.x and above for
  supported Python versions.
• Relaxed pillow dependency requirements to allow for use of 8.x and above for
  supported Python versions.
• Relaxed click dependency requirements to allow for use of 8.x and above for
  supported Python versions.
• Relaxed Python version requirement to allow for use of 3.8 and above.
• Removed pygerber.sequence_tools module.
• Removed pygerber.frozen_general_model module.
• Removed pygerber.gerber.linter.diagnostic module.
• Removed pygerber.warnings module.
• Updated documentation links to point to stable release documentation.
• Renamed GerberX3Builder.add_trace() to GerberX3Builder.add_line_trace() to be consistent with GerberX3Builder.add_clockwise_arc_trace() and GerberX3Builder.add_counter_clockwise_arc_trace().
• Added support for Altium implied leading zeros omitted. Contributed by @sjgallagher2 in Add support for Altium implied leading zeros omitted #340.
• Added arc drawing in GerberX3Builder.
• Added region statement generation to GerberX3Builder.
• Added Gerber to PNG, JPEG, TIFF, BMP, WEBP and SVG conversion commands to CLI.
• Added Gerber format command to CLI.
• Extended documentation.

Done in this release:

• Update command line interface to use new tools
  • Trash the old desing
  • Implement with new APIs
  • Add tests
• Move unit tests to test/unit/
• Remove sequence_tools.py
• Remove frozen general model class
• Add test for __main__.py
• Move E2E formatter tests out of test/gerberx3/test_formatter.py
• Use svglib + reportlab for SVG dumping as PNG files
• Separate E2E and Unit tests in CI
• Add arc drawing to AST builder
• Add Gerber Json projects support
• Add automatic checking against reference files to E2E tests