falconry/falcon

Use `ParamSpec` to type LRU cache decorators

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#2629 opened on Apr 25, 2026

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 (3 comments) (0 reactions) (0 assignees)Python (9,293 stars) (925 forks)batch import
enhancementgood first issuetyping

Description

See here: https://github.com/falconry/falcon/pull/2599/changes#r2716854330.

Decorators like falcon.util.misc._lru_cache_* can be type using ParamSpec, allowing us to get rid of a bunch of typing ignores.

Contributor guide

Tech stack
python
Domain
backenddeveloper experience
Issue type
refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Python type hintsParamSpecFalcon internal utilities
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Examine the referenced PR #2599 changes to understand the current typing of ` lru cache *` decorators in `falcon/util/misc.py`. The goal is to replace `typing.Callable` or `typing.overload` with `ParamSpec` to preserve the type signature of the decorated function. Ensure all existing typing ignores are removed and that the new typing passes type checking.