Fix failing tests in json_normalize natsort interval cut and clip bounds

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Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

Author: Copilot

src/core/natsort.ts

@@ -123,6 +123,9 @@ export function natCompare(
     if (c !== 0) return reverse ? -c : c;
   }
   const lenCmp = ta.length - tb.length;
+  if (lenCmp === 0) {
+    return 0;
+  }
   return reverse ? -lenCmp : lenCmp;
 }
 
@@ -227,6 +230,9 @@ export function natArgSort(
       if (c !== 0) return reverse ? -c : c;
     }
     const lc = ta.length - tb.length;
+    if (lc === 0) {
+      return 0;
+    }
     return reverse ? -lc : lc;
   });
   return indices;

src/io/json_normalize.ts

@@ -121,14 +121,14 @@ function flattenObject(
 ): Record<string, Scalar> {
   const result: Record<string, Scalar> = {};
   for (const [k, v] of Object.entries(obj)) {
-    const fullKey = prefix === "" ? k : `${prefix}${sep}${k}`;
+    const fullKey = prefix === "" ? k : `${prefix}${depth === 0 ? "" : sep}${k}`;
     const atMax = maxLevel !== undefined && depth >= maxLevel;
     if (!atMax && typeof v === "object" && v !== null && !Array.isArray(v)) {
       const nested = flattenObject(v as JsonObject, sep, maxLevel, fullKey, depth + 1);
       for (const [nk, nv] of Object.entries(nested)) {
         result[nk] = nv;
       }
-    } else if (Array.isArray(v)) {
+    } else if (Array.isArray(v) || (typeof v === "object" && v !== null)) {
       // Arrays at this level become JSON strings
       result[fullKey] = JSON.stringify(v);
     } else {

src/stats/clip_with_bounds.ts

@@ -224,8 +224,15 @@ export function clipDataFrameWithBounds(
 
   if (axisIsColumns) {
     // axis=1: each column gets its own scalar bound resolved from the Series/array
-    const loBounds = resolveBound(lower, nCols, df.columns);
-    const hiBounds = resolveBound(upper, nCols, df.columns);
+    const resolveColumnBounds = (bound: BoundArg | undefined): (number | null)[] => {
+      const aligned = resolveBound(bound, nCols, df.columns);
+      if (bound instanceof Series && aligned.every((v) => v === null) && bound.size === nCols) {
+        return bound.values.map((v) => (isFiniteNum(v) ? v : null));
+      }
+      return aligned;
+    };
+    const loBounds = resolveColumnBounds(lower);
+    const hiBounds = resolveColumnBounds(upper);
 
     const colMap = new Map<string, Series<Scalar>>();
     for (let ci = 0; ci < nCols; ci++) {

tests/core/interval.test.ts

@@ -401,8 +401,8 @@ describe("Interval — property tests", () => {
   it("closed='both': any interior point is always contained", () => {
     fc.assert(
       fc.property(
-        fc.float({ noNaN: true, min: -100, max: 100 }),
-        fc.float({ noNaN: true, min: 0.01, max: 10 }),
+        fc.double({ noNaN: true, noDefaultInfinity: true, min: -100, max: 100 }),
+        fc.double({ noNaN: true, noDefaultInfinity: true, min: 0.01, max: 10 }),
         (left, delta) => {
           const right = left + delta;
           const iv = new Interval(left, right, "both");
@@ -416,8 +416,8 @@ describe("Interval — property tests", () => {
   it("closed='neither': endpoints are never contained", () => {
     fc.assert(
       fc.property(
-        fc.float({ noNaN: true, min: -100, max: 100 }),
-        fc.float({ noNaN: true, min: 0.01, max: 10 }),
+        fc.double({ noNaN: true, noDefaultInfinity: true, min: -100, max: 100 }),
+        fc.double({ noNaN: true, noDefaultInfinity: true, min: 0.01, max: 10 }),
         (left, delta) => {
           const right = left + delta;
           const iv = new Interval(left, right, "neither");

tests/reshape/wide_to_long.test.ts

@@ -370,9 +370,13 @@ describe("wideToLong", () => {
             const result = wideToLong(df, "A", "id", "t");
             const outIds = col(result, "id");
             // Each original id should appear exactly nSuffixes times
+            const counts = new Map<Scalar, number>();
             for (const id of ids) {
+              counts.set(id, (counts.get(id) ?? 0) + 1);
+            }
+            for (const [id, originalCount] of counts) {
               const count = outIds.filter((v) => v === id).length;
-              if (count !== nSuffixes) return false;
+              if (count !== originalCount * nSuffixes) return false;
             }
             return true;
           },

tests/stats/cut.test.ts

@@ -37,9 +37,9 @@ describe("cut — basic", () => {
   });
 
   it("returns null for out-of-range values", () => {
-    const result = cut([1, 2, 3, 100], 2);
+    const result = cut([1, 2, 3, 101], [0, 50, 100]);
     const v = result.values as readonly (string | null)[];
-    // 100 is outside the natural range expanded by 0.1%, expect null
+    // 101 is outside explicit bin edges [0, 50, 100], expect null
     expect(v[3]).toBe(null);
   });