Changes in version 0.3.0 (2026-03-05)                  

  - Removed as_decido() which wasn't fully worked out.

  - Fixed wkpool() which never worked before.

  - Added check_wkpool helper function.

                        Changes in version 0.2.0                        

Round-trip to wk

  - arcs_to_wkt() / arcs_to_wkb() — arcs become linestrings
  - cycles_to_wkt() / cycles_to_wkb() — cycles become polygons, with
    hole nesting
  - segments_to_wkt() / segments_to_wkb() — raw segments as linestrings,
    multilinestring, or points

Arc-node topology

  - vertex_degree() counts segments touching each vertex
  - find_nodes() identifies branch points and endpoints (degree ≠ 2)
  - find_arcs() extracts maximal segment sequences between nodes
  - as_arcs() returns wkpool with .arc column for arc membership
  - arc_node_summary() reports arc/node structure statistics

Arcs are the "uninterrupted lines" — sequences of segments passing only
through degree-2 vertices. Useful for line simplification, network
extraction, and efficient storage.

                        Changes in version 0.1.0                        

Initial release. Vertex pool topology for wk-handleable geometry.

Core functions

  - establish_topology() converts any wk-handleable geometry to segments
    + vertex pool
  - merge_coincident() discovers shared vertices (exact or
    tolerance-based)
  - pool_vertices(), pool_segments(), pool_feature() access the
    structure
  - pool_combine() merges multiple pools with proper index remapping
  - pool_compact() removes unreferenced vertices

Topology discovery

  - find_shared_edges() finds edges shared by multiple features
  - find_internal_boundaries() finds edges traversed in opposite
    directions (true shared boundaries)
  - find_neighbours() builds adjacency from shared edges or vertices
  - topology_report() summarizes vertex/edge sharing

Cycle and winding analysis

  - find_cycles() discovers closed rings from segment connectivity
  - cycle_signed_area() computes signed area (shoelace formula)
  - classify_cycles() identifies outer rings vs holes by winding
  - reverse_cycle() flips winding direction
  - hole_points() extracts hole centroids for triangulation
  - Convention support: "sf" (default) or "ogc" winding rules

Triangulation export

  - as_pslg() exports to RTriangle format (P, S matrices)
  - as_decido() exports to decido format (0-indexed)

vctrs integration

  - wkpool is a vctrs rcrd: subset, combine operations work
  - plot.wkpool() for quick visualization

Design principles

  - Segments are the atomic primitive — the waist of the hourglass
  - Observe, don't correct — represent truth, fixing is separate
  - Minted .vx integers for stable vertex identity
  - Feature provenance tracked via .feature