Step / Digital Line + Mountain

Stairs instead of diagonals via step on type: 'line' / type: 'area' (SciChart isDigitalLine). true ≡ 'after'. Mountain fill follows the stepped top edge when areaStyle is set.

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Modes: after (hold y until next x), before (vertical first), middle (half-step). Linear = omit / false. Hit-test reports source samples, not densified corners.