[GRASS-git] [OSGeo/grass] 404331: lib: more robust signed polygon size (#7366)

[Markus Metz]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 404331e25c85d8d98aa1021db111b6c52382a671
      https://github.com/OSGeo/grass/commit/404331e25c85d8d98aa1021db111b6c52382a671
  Author: Markus Metz <33666869+metzm at users.noreply.github.com>
  Date:   2026-05-07 (Thu, 07 May 2026)

  Changed paths:
    M lib/gis/area_poly2.c
    M lib/vector/diglib/poly.c
    A vector/v.build/testsuite/data/tiny_polygons.pack
    M vector/v.build/testsuite/test_v_build.py
    M vector/v.to.db/testsuite/test_v_to_db.py

  Log Message:
  -----------
  lib: more robust signed polygon size (#7366)

* robust signed polygon size
* add test
* example to correctly compare fp numbers



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