source-academy / plugins / 37758191622

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feat(data-visualizer): let a language name its empty value (#123)

Add an optional displayValue to the "empty" wire node. The host shows it
when the empty value is drawn on its own, instead of always "null", so
Python can show draw_data(None) as None. Without it, "null" is kept.

Refs #115

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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