[jaideeppyne]

urlencode only called .items() for dict, so mapping types such as UserDict and MappingProxyType were iterated as keys. String keys then unpacked into (character, character) pairs and produced a corrupted query string.

from collections import UserDict
from jinja2 import Environment

Environment().from_string("{{ q|urlencode }}").render(q=UserDict({"Aa": "PersonA@123.com"}))
# before: A=a
# after:  Aa=PersonA%40123.com

Fixes #2269

[davidism]

https://palletsprojects.com/contributing/llm-ai