Index: node_modules/d3-array/src/mode.js
===================================================================
--- node_modules/d3-array/src/mode.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-array/src/mode.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,28 @@
+import {InternMap} from "internmap";
+
+export default function mode(values, valueof) {
+  const counts = new InternMap();
+  if (valueof === undefined) {
+    for (let value of values) {
+      if (value != null && value >= value) {
+        counts.set(value, (counts.get(value) || 0) + 1);
+      }
+    }
+  } else {
+    let index = -1;
+    for (let value of values) {
+      if ((value = valueof(value, ++index, values)) != null && value >= value) {
+        counts.set(value, (counts.get(value) || 0) + 1);
+      }
+    }
+  }
+  let modeValue;
+  let modeCount = 0;
+  for (const [value, count] of counts) {
+    if (count > modeCount) {
+      modeCount = count;
+      modeValue = value;
+    }
+  }
+  return modeValue;
+}