all these changes

frontend/node_modules/d3-array/src/merge.js

@@ -0,0 +1,21 @@
+export default function(arrays) {
+  var n = arrays.length,
+      m,
+      i = -1,
+      j = 0,
+      merged,
+      array;
+
+  while (++i < n) j += arrays[i].length;
+  merged = new Array(j);
+
+  while (--n >= 0) {
+    array = arrays[n];
+    m = array.length;
+    while (--m >= 0) {
+      merged[--j] = array[m];
+    }
+  }
+
+  return merged;
+}