Function generators return constant function if seed provided

Description

(repeatedly 10 (mg/generate [:=> :cat :int]))
;=> (-480372 -103 7423 229 83 7937941 -4610 24 -1 21924979)
(repeatedly 10 (mg/generate [:=> :cat :int] {:seed 0}))
;=> (1784201 1784201 1784201 1784201 1784201 1784201 1784201 1784201 1784201 1784201)

;; even for different inputs
(mapv (mg/generate [:=> [:cat :int] :int] {:seed 0}) (range 10))
;=> [1784201 1784201 1784201 1784201 1784201 1784201 1784201 1784201 1784201 1784201]

Contributor guide

Tech stack

None

Domain

data

Issue type

bug

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.

stale

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

clear

Prerequisites

Clojure basicsMalli library usage

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

35

Research direction

Examine the implementation of `mg/generate` in the malli source code, particularly how seeds are handled. Look for how the generator function is created and whether it inadvertently captures a fixed state from a single call to `mg/generate`. Suggest a fix that ensures each call to the generated function produces new values even when a seed is provided, possibly by re seeding internally or using a lazy sequence. Reference the file `src/metosin/malli/generator.cljc`.