stack 0 on the active side

(alternative/complement to #1967)
observablehq · Jan 3, 2024 · 1f44341 · 1f44341
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commit 1f44341
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diff --git a/src/transforms/stack.js b/src/transforms/stack.js
@@ -106,7 +106,7 @@ function stack(x, y = one, kx, ky, {offset, order, reverse}, options) {
             const y = Y[i];
             if (y < 0) yn = Y2[i] = (Y1[i] = yn) + y;
             else if (y > 0) yp = Y2[i] = (Y1[i] = yp) + y;
-            else Y2[i] = Y1[i] = yp; // NaN or zero
+            else Y2[i] = Y1[i] = yp || yn; // NaN or zero
           }
         }
         facetstacks.push(stacks);