metosin/malli

Full support for decimal

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#1,272 opened on Apr 1, 2026

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 (1 comment) (0 reactions) (0 assignees)Clojure (237 forks)batch import
enhancementhelp wanted

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Description

Hello :) Found myself having to make some stylistic compromises with decimals in my schema, and would have liked it if it was supported like a :double schema with min max preds and bound generation.

Alternatives:

  • use decimal? and custom generators / and :and for bounds
  • define my own schema

Thanks

Contributor guide

Research direction
Design and implement a :decimal schema type in malli with min, max, and constraint generation, similar to :double, and handle precision/rounding using Clojure's BigDecimal.
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Clojure
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70