True when two option objects agree on every construction-time option (legend, sonify,
strings) — i.e. an existing chart built with a can absorb b via update(). Adapters
use this to decide between updating in place and remounting (see the React wrapper).
fcharts — fast, accessible charts.
Renders 100k+ points at 60fps on a canvas while remaining keyboard-navigable, screen-reader-announced, and find-in-page-able through a real-DOM accessibility layer.