diff --git a/packages/core/test/value.test.mjs b/packages/core/test/value.test.mjs
index ae227e17..1a209623 100644
--- a/packages/core/test/value.test.mjs
+++ b/packages/core/test/value.test.mjs
@@ -6,6 +6,8 @@ This program is free software: you can redistribute it and/or modify it under th
 
 import { describe, it, expect } from 'vitest';
 import { map, valued, mul } from '../value.mjs';
+import controls from '../controls.mjs';
+const { n } = controls;
 
 describe('Value', () => {
   it('unionWith', () => {
@@ -21,4 +23,8 @@ describe('Value', () => {
     expect(valued(mul).ap(3).ap(3).value).toEqual(9);
     expect(valued(3).mul(3).value).toEqual(9);
   });
+  it('union bare numbers for numeral props', () => {
+    expect(n(3).cutoff(500).add(10).firstCycleValues).toEqual([{ n: 13, cutoff: 510 }]);
+    expect(n(3).cutoff(500).mul(2).firstCycleValues).toEqual([{ n: 6, cutoff: 1000 }]);
+  });
 });
diff --git a/packages/core/value.mjs b/packages/core/value.mjs
index 7eb89013..f9a963ce 100644
--- a/packages/core/value.mjs
+++ b/packages/core/value.mjs
@@ -7,6 +7,13 @@ This program is free software: you can redistribute it and/or modify it under th
 import { curry } from './util.mjs';
 
 export function unionWithObj(a, b, func) {
+  if (typeof b?.value === 'number') {
+    // https://github.com/tidalcycles/strudel/issues/262
+    const numKeys = Object.keys(a).filter((k) => typeof a[k] === 'number');
+    const numerals = Object.fromEntries(numKeys.map((k) => [k, b.value]));
+    b = Object.assign(b, numerals);
+    delete b.value;
+  }
   const common = Object.keys(a).filter((k) => Object.keys(b).includes(k));
   return Object.assign({}, a, b, Object.fromEntries(common.map((k) => [k, func(a[k], b[k])])));
 }