Interface WriteOmlOptions

Collapse maximal runs of >= 2 consecutive same-label edges into label: [v1, v2, ...] array syntax (issue #218 upstream). A run of length 1 still writes as a plain scalar edge; a run is never merged across an edge with a different label in between. Default false produces output byte-identical to arrays not existing at all.

Pretty-mode indent width in spaces (default 2). null renders a single-line, machine-oriented form instead: edges joined by "; ", no newlines/padding -- mirroring write_json's own indent: null convention. Both forms round-trip through readOml.