Use resolve shared instead of steps

src/compile/data/density.ts

@@ -16,11 +16,6 @@ export class DensityTransformNode extends DataFlowNode {
     this.transform = duplicate(transform); // duplicate to prevent side effects
     const specifiedAs = this.transform.as ?? [undefined, undefined];
     this.transform.as = [specifiedAs[0] ?? 'value', specifiedAs[1] ?? 'density'];
-
-    // set steps when we are grouping so that we get consitent sampling points for imputing and grouping
-    if (transform.groupby && transform.minsteps == null && transform.maxsteps == null && transform.steps == null) {
-      this.transform.steps = 200;
-    }
   }
 
   public dependentFields() {
@@ -42,6 +37,9 @@ export class DensityTransformNode extends DataFlowNode {
       field: density,
       ...rest
     };
+    if (this.transform.groupby) {
+      result.resolve = 'shared';
+    }
     return result;
   }
 }