parse: decodeDotInKeys does not decode lowercase percent-encoded dots #634

On current main, decodeDotInKeys: true decodes %2E but not the equivalent lowercase %2e, producing different property names. RFC 3986 section 2.1 defines hexadecimal digits in percent encodings as case-insensitive.

var qs = require('qs');
var input = 'name%252eobj.first%252ename=John&name%252Eobj.last%252Ename=Doe';
console.log(qs.parse(input, { decodeDotInKeys: true }));

Expected: { 'name.obj': { 'first.name': 'John', 'last.name': 'Doe' } }

Actual: { 'name%2eobj': { 'first%2ename': 'John' }, 'name.obj': { 'last.name': 'Doe' } }

Reproduced on main 234d505 with Node.js 24.21.0. The later replacement in parseObject only matches uppercase escapes. A regression test fails before the one-character flag fix and passes afterward.

Disclosure: found and prepared with AI assistance (Hermes Agent, gpt-6.1-sol), including independent agent review; no claim of personal production use.