m/-tuple-transformer is broken in many ways

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Description

;; ok
(m/decode
  [:tuple string? string?]
  []
  (mt/string-transformer))
; => []

;; fail
(m/decode
  [:tuple keyword? string?]
  []
  (mt/string-transformer))
; => [nil]

;; megafail
(m/decode
  [:tuple string? keyword?]
  []
  (mt/string-transformer))
; =throws=> Execution error (IndexOutOfBoundsException) at malli.core/-update (core.cljc:194).

Contributor guide

Research direction

Examine the failing test cases and trace the code path in malli.core/ update to find why the tuple transformer breaks with certain schemas.

Tech stack

clojure

Domain

backend

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

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.

Active

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

Clear

Prerequisites

ClojureGit

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

60