[knowledgecode]

Summary

• Fix three cases where the output differed from jQuery 4's $.param():
  • Array items under a key already ending in [] are added as-is ({ 'ids[]': [1, 2] } -> ids[]=1&ids[]=2, previously ids[][]=1&ids[][]=2)
  • Top-level empty-string keys are serialized ({ '': 'foo' } -> =foo, previously dropped)
  • Recursion follows jQuery's toType() class list, so Map, Set, typed arrays, arguments, and objects with a custom Symbol.toStringTag are walked key by key instead of stringified
• Add 15 equivalence cases covering these inputs, and fix a duplicated test name (function #9 -> function #10)
• README: point the traditional browser example at jquery-param.min.js (and close its <script> tag), and state that the output is tested against jQuery 4.x
• CI: update actions/checkout and actions/setup-node to v7 (node24) and drop the build step that npm test already runs
• Bump version to 1.2.10 and update dev dependencies (jsdom, rollup, vitest)

Behavior changes

Output changes only for inputs where it previously differed from jQuery:

Input	1.2.9	1.2.10 (= jQuery 4)
{ 'ids[]': [1, 2] }	ids[][]=1&ids[][]=2	ids[]=1&ids[]=2
{ '': 'foo' }	(empty)	=foo
{ u: new Uint8Array([7, 8]) }	u=7,8	u[0]=7&u[1]=8
{ m: new Map([['a', 1]]) }	m=[object Map]	(empty)

Commits

• test: fix duplicate name of the RegExp function case
• fix: match jQuery 4 for bracketed keys, empty keys, and non-plain objects
• docs: fix UMD script example and update tested jQuery version
• ci: update actions to v7 and drop redundant build step
• chore: bump version to 1.2.10 and update dev dependencies

Test plan

• npm test builds and passes all 114 test cases (99 existing + 15 new)
• The new cases fail against the previous implementation (11 of 15; the other 4 lock in behavior that already matched)
• All three build outputs contain the new logic
• The UMD build exposes the global param in a clean context: param({ 'ids[]': [1, 2] }) -> ids%5B%5D=1&ids%5B%5D=2