Allow more than one pair of `key-schema` `value-schema` for `:map-of`

Description

[:map-of {}
  :keyword :int
  [:re #"^([a-z][a-z0-9]*)+(-[a-z0-9]+)*\\-ext$"] [:map ,,,]]

{
  "type": "object",
  "patternProperties": {
    "^([a-z][a-z0-9]*)+(-[a-z0-9]+)*\\-ext$": {},
    "^([a-z][a-z0-9]*)+(-[a-z0-9]+)*\\-ext-definition$": {}
  },
  "additionalProperties": false
}

Contributor guide

Tech stack

None

Domain

backend

Issue type

feature

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.

1-2 days

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

mostly clear

Prerequisites

Clojure basicsmalli library familiarity

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

30

Research direction

Examine the current implementation of `:map of` in malli's source code (likely in `malli.core`). Review the existing JSON schema compatibility and how `patternProperties` are handled. Look at the discussion in comments for any suggested approaches. Consider extending the schema to accept multiple key/value schema pairs by modifying the parser and validation logic.