• fix: DST rollover periods were dropping axis splits when zoomed in to <= 1hr resolutions
• fix: more accurate floating point math when generating axis splits with decimals.
• fix: regression caused by precision increase and add more guards against infinite loops.
• fix-demo: tooltips-closest failed to toggle tooltip display on plot re-entry.
• fix-demo: tooltips-closest was drawing interpolated markers outside plotting area when zoomed in.