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MolecularGraph v0.21.0

Diff since v0.20.2

Breaking changes - Updated molecule property accessors (#130). props has been removed, and get_prop / set_prop! are now deprecated; use Base.getindex and Base.setindex! instead.

New features - Added VirtualAtom as an experimental feature. This enables treating atom placeholders (R-groups) and molecular fragments (e.g., amino acid residues) as atom vertices. - Enhanced has_exact_match and has_substruct_match to support stereospecific queries with the option stereo=true (#133).

Bug fixes - Fixed on_init and on_update callbacks for automatic property recalculation to allow adding custom preprocessing methods (e.g., remove_all_hydrogen!, extract_largest_component!, protonate_acids!). - Fixed SMILES parser to correctly recognize the order of atom properties (#124). - Improved text placement in 2D drawings.

Closed issues: - Breaking changes in v0.20.0 (#129) - substructure match fails if hydrogen nodes are present (v0.20) (#136)

Source: README.md, updated 2025-08-27